Here are 2 websites to go to for building your emergency kit
http://www.readyla.org/
and
http://www.mysafela.org/survival-kit/
Some basics that they recommend:
-Water! - This is the most important thing, I cannot stress that enough. Water will be compromised and takes forever to fix. They say you need 1 gallon per day per person for 3 days. I keep 2 cases in the house, 1 case in my car, I also have water in my bug out bag. I have a separate "cooler" type bag with a bunch of water bottles in it too. You can never ever have enough water!
-Food - Nonperishable like canned goods. There are prepackaged cases of stuff you can buy on Amazon that are pretty good too. The fact is though that eating is going to be a stress reaction as well, so it pays to have snack food on hand. I always have fruit like melon and plums because it's good for hydration and for snacking/energy. Celery too as it's mostly water. They recommended protein and nutrition bars because they won't go bad and are easy to store/keep. Eating utensils are also important, and they have camping ones that are little fold out kit things that are good to keep in your bug out bag.
You can also find weird ones like these if you're a fan of sporks:
https://www.wish.com/search/utensils%20camping#cid=57a0167e63d48055a7213af0
or
https://www.wish.com/search/utensils%20camping#cid=546eda9d3dabbe7063d087f3
-Flashlight - I'm a big fan of the chinese cheapo lanterns on wish that are dual lanterns and flashlights, but have a solar charger on top. These also work as a backup battery for phones. The best place to get them are Wish.com and Aliexpress. I prefer the ones with the strap like this: https://www.wish.com/search/solar%20lantern#cid=582fe4a3e173470de939a3a5 I keep them in my vehicle, in my bedroom, and one in each room. Power WILL go out, and it's usually the slowest thing to be restored, it can take a week or longer after a disaster. Headlamps are also vital! They keep your hands free and the light focused where you need it to be, the only downside is that they often take batteries so keep extra batteries handy!
-Battery-powered/HandCrank radio - When you are looking for something like this, I recommend something with a solar panel as well. What you want to make sure is that it has AM, FM **and** weatherband. https://www.wish.com/search/solar%20hand%20radio#cid=591be5ac51be5127f18af502
-First aid kit - any and all are good, I'd also add a stethescope and BP cuff. It's really easy to learn how to use them and it's a good way of knowing how you and others are doing. Latex gloves are a must, and a small pen light is important too. I really stress adding some chemical ice packs as well. People are going to twist stuff, sprain stuff, and nothing is better than ice!
-Medications - In addition to your normal ones, I always keep extra stuff for heartburn, diarrhea, both tylenol and ibuprophen, and anti-allergy stuff. Earthquakes can kick up a lot of dust and debris and even if you don't sneeze, you can get nasty rashes/hives from whats in the air and what you rub against. Remember, if you sprain your ankle or hurt something, you can take the max dose of tylenol and ibu at the same time. They work differently and both will bring the pain down.
-Multipurpose tool and Duct tape - In addition to that, I recommend a good folding shovel, axe and prytool. Something like this Lil Pro bar can be really usefull to pop doors, or get through debris. http://www.thefirestore.com/store/product.aspx/productId/13099/Fire-Hooks-Unlimited-Lil-Pro-Bar-12-Length/
Stanley makes the fubar series: https://www.amazon.com/Stanley-55-121-FuBar-Forcible-Entry/dp/B002PEGFVW/
I'm in a condo/apt building... I know that this building will shift, and I will need to use tools to evacuate. Duct tape is always useful, and a good multifuction tool like a gerber or SOG is very handy. I prefer SOG tools myself.
-Sanitation/Hygiene - Always have a roll of toilet paper, the little packs of wet wipes are usefull too! Hand sanitizer is good, and kitty litter is great. Urine is urine, and kitty litter in a bucket with a toilet seat on top makes for a scoopable potty for men and women with minimal smell. I also keep a roll of scented garbage bags next to it. Also waterless soap, waterless shampoo, toothbrush and even just a basic comb and brush are important to have.
-Personal documents - they say to keep it in a ziplock bag, which is smart, I also have a small pelican crush-proof/waterpoof box I keep the copies in. Originals are in a fireproof safe! The copies and the small box are in my bugout bag. If an earthquake hits, you might have seconds to put on shoes, and grab the bag and go! I'll add more about that later.
-Cell phone with chargers - I really like the solar panel battery packs and have a bunch of them. There are some with foldout solar panels like this:
https://www.wish.com/search/solar%20battery#cid=58f43b2b4b1c5b10ef1dae99
others just have it built in like this:
https://www.wish.com/search/solar%20battery#cid=5964cc3de81e8a55c1bc8441
I also recommend the 25+W solar panel kits like this:
https://www.wish.com/search/foldable%20solar#cid=5937a3f11298195dd1933d47
The more you can rely on solar the better! Also because it gets F-ING! hot here, and A/C won't be an option, I recommend getting a couple of small portable fans.
There are small ones like these:
https://www.wish.com/search/fan%20battery#cid=5788969ef3b0784decbf8397
but i prefer the ones that are also powerbanks too:
https://www.wish.com/search/Fan%20with%206000mAh%20Power%20Bank%2C#cid=591d6c5665c58127e6e97c01
Remember, it could be weeks with no electricity, at least this way you have a way to charge your phones, and keep cool, and using the foldout solar panel, you can recharge them as well.
-Family and Emergency Contact info - I have it printed out and in a ziplock bag in my bag, another one folded up in my wallet.
-Cash - ATMs and apple pay, and all that stuff doesn't work. cash in small bills does. Keep it spread out, some in the house, some in your bugout bag, some in the car.
-Emergency blanket - I love these, and keep a few everywhere.
-Maps of the area - Useful I guess?
Some other stuff that is recommended on a few lists and stuff I highly recommend
--- so that's it for the MySafeLA list, but i'm going to add more that I believe is very important
-Hardhat - A good hardhat is worth it's weight in gold.
-eye protection - Same, you've seen the videos from mexico, debris and dust is hell.
-breathing masks (NIOSH-N95) - Keep a bunch of these handy in both your bugout bag and by your bed.
-work gloves - I prefer the ones with the forearm protection as well. The more you can protect the better.
-boots - While you may not be able to put them on right away, you want a good pair with you. After the Northridge earthquake it was almost a week and a half before the cleaned up all of the debris and glass from my area
-whistle - Fox 40 is the world renowned one but there's a bunch of different survival whistles. I keep one in my bag, one in my car, and one by my bed.
-Smoke mask and escape ladder- if you live in a multiunit/multi story building you might want to look into getting smoke masks and escape ladders. Most buildings are designed to NOT burn due to either sprinklers, or fire breaks. In an earthquake, sprinklers will not work if there is no water pressure, and fire breaks like doors and stuff will be compromised. They're not cheap, but if you're 4 or 8 to 10 stories up and elevators aren't working and the stairwell and hallways are charged with smoke... no one is coming to save you, you need to save yourself! Just google smoke escape hoods, and escape ladders. If you're low enough, you can punch out the window, hook the ladder onto the window rim, and go out and down that way!
-rope - Rope is just always a good thing to have
-air panel - A good Signal Panel Marker can be really useful. They come in different sizes and colors, the orange/pink is a standard combo: https://www.amazon.com/Army-Signal-Panel-Marker-8345-00-174-6865/dp/B073X55RZB/
but I also recommend a good signal mirror as well. https://www.amazon.com/Coghlans-Survival-Signal-Mirror-Size/dp/B000C8BEEG
-chalk - You can write on doors, mark places that are safe and unsafe and let people know where you go.
-door wedge - buildings shift, doors jam, some doors you want to keep open, especially to let in firefighters or for cross ventilation. I like the wedge it door stops because they work in 3 ways and with almost every door. https://www.amazon.com/Wedge-WEDGE-Ultimate-Door-Green/dp/B00N4M2UCM/ I usually stick a large carabiner through the hole and carry 2 or 3.
-ziplocks of all sizes - it's good for just storing stuff. From jumbo to small size, I keep a ball of them in my bag
-lightsticks - I'm not really a fan of these, but a lot of people are. You can carry them as you see fit.
-tarp/ground cover - if you have to leave your home, these things can be useful. Just type in picnic blanket or tarp, and you'll see all sorts of designs like this one https://www.wish.com/search/picnic%20blanket#cid=59c21f19dbf1c916ccdf61cb
-Sleeping bags - May be necessary! You can also find these self inflating pads https://www.wish.com/search/emergency%20sleeping#cid=58ee18b7fa9a051919c17f74 and bags https://www.wish.com/search/emergency%20sleeping#cid=540038097e6f6c14a2813134
-inflatable pillow - Gotta be comfortable!
-Extra clothes, including socks. Light jacket too
-rain poncho - Earthquakes can happen in the rain, plus it's a good ground cover
-towel - A good towel is so important. It makes for a quick pillow, another blanket, a sheet, and so many uses. Even to just wrap around and hold an ice pack or two