There was a time when it only came in cans like these:
Sounds good to me!
Or you could buy it in a can containing frozen concentrate, like this:
Here's an ad for canisters of powdered drink mix (sorry for the bad image - but you get the idea):
I actually like to add it to some water in a bottle, and then I just leave it in the refrigerator and take a few swigs every now and then.