This is hypothetical, because, like I'll get into, I don't think they're all littles/do littlespace the same way, but it is fun :)
Naruto: ramen broth (with or without ramen noodles)
Sasuke: tomato juice
Sakura: Monster energy
Sai: Arizona Iced Tea
Ino: very specifically made latte
Shikamaru: anything from the fridge+a few ice cubes so it'll melt during the day and he'll go longer without having to refill it.
Choji: honestly just like. orange juice. sometimes a soda, a peppermint hot cocoa when it's cold. nothing scandalous
Kiba: beef stew
Shino: sugar water (for the bugs)
Hinata: non caffeinated soda, like Sprite or root beer. also sometimes energy drink
Lee: electrolyte enhanced water babey! No excess sugar or caffeine for this youthful boi
Tenten: Cold brew coffee
Neji: La Croix