What kind of pill or drink can i MAKE to help me stay awake for a long time?

i heard about the adiral and stuff but i cant get it from anyone and getting it priscribed is too much work, my sister has some but i asked her a billion times and she wont let me take just one adiral. and i dont want to buy a bunch of monsters or 5 hour energys all the time so what drink can i make that will keep me awake?? and what pills can i buy to keep me awake for a while that i can find that are un prescibed and at like walgreens?