or my personal favortie cranberry juice
5-alive (do they still make that shit was so good), Cranberry is good, any lemon lime soda.
Also I have done this with rum and vodka, my sound horrible but it is actually great. In college we called in moose Juice.
A bottle or two of vodka, case of beer, frozen oj that comes in a can. Mix it up in a cooler or one of those huge water jugs. Ice it down and go to town. Shit is actually really good and gets you hammrocked.
You can also buy a bunch of fresh fruit chop it up throw it into cooler, pour the vodka on top of it. Let it soak for an hour or so. Then throw some fruit punch in. Once all the vodka is done you can get the fruit and get torn back, great for hangovers.
7up usually. If you want to get real drunk easily though, mix vodka with that pure lime/ lemon extract juice stuff for cooking. the taste of the juice stuff overpowers the vodka so hard so you barely have to put any in. so instead of drinking like 50-50 mixes, this is like 90% vodka and 10% juice, but you can only taste the juice. its pretty sour though so if thats not you thing, leave this alone lol.
[warning]: this can easily lead to being so drunk you black out, hug a toilet seat for a while, and end up sleeping on your buddy's heated bathroom floor. trust me....pace yourself on this shit.