Nobody has explained this bit so here.
In my part of the UK at least, the suffix -ade basically means carbonated / fizzy / bubbly.
Orange juice will not be fizzy or carbonated, it’ll be the natural thing you get from squeezing oranges. Orange squash will be more of a chemical orange concentrate that you add water to, to make a drink that tastes like orange juice. Orangeade will be a carbonated/fizzy orange drink.
Lemon juice will be the natural thing you get from squeezing lemons. Lemon squash will be some sugary lemon concentrate, which you can add water to and it becomes a tasty lemon flavoured drink. Lemonade is fizzy/carbonated lemon drink.
Apple juice is what you get naturally from squeezing apples. Apple squash is a concentrated sugary thing that you can add water to to get a shitty approximation of apple juice. Appleade is specifically a fizzy carbonated apple drink.
Cherryade will be a fizzy carbonated cherry drink, while cherry juice would be still, and cherry squash would usually require mixing with water.
I’ve never seen someone advertise, say, pomegranateade, but my assumption would be that it is a fizzy carbonated pomegranate drink. Because that’s what -ade means.
When I first came to America I was absolutely fucking baffled by the fact I kept asking for “lemonade” and getting stuff that was not fizzy. It literally feels like ordering “lemon fizzy please” and then getting lemon that is not fizzy. And when you’re like “I ordered lemon fizzy?” they’re like “that is lemon fizzy” and you look at it and it’s not fizzy. Insanity
Anyway, if you want American lemonade in the UK, “lemon squash” is what you want. It might be hard to find at restaurants because it isn’t very popular, but it’s pretty easy to find in big supermarkets. It will look like this:
And you just mix a very small amount of that stuff with water. DO NOT DRINK IT STRAIGHT as you will have a bad time.
UK style squash is a good budget option, especially for families with kids. It’s not as good as fruit juice, but you can go to the store and buy £3 of fruit juice and literally finish it all over dinner and then not have any tomorrow, whereas you can buy £3 of squash and have enough for a week or two. It’s very concentrated, so you mix a tiny bit of squash with lots of water to get a drink, and so your bottle of squash can last you longer.
The closest thing I’ve been able to find in the US - other than lemonade powder I guess - is those squeezy mio bottles
At first I was really annoyed I couldn’t find squash in the US, but the mio stuff is actually pretty decent. It’s so small you can pocket it and lasts a surprisingly long time for such a tiny bottle. It’s squash on steroids, you literally only need one squirt in a glass of water.
For bonus points: it is borderline impossible in the USA to find Ribena / blackcurrant squash. I grew up on every kids’ birthday party having 2 options - orange juice or Ribena. It’s just such a normal drink and most Americans have never had it. If you’re visiting the UK, get some blackcurrant flavoured things!