I've always saved plastic bottles (I have no idea why) So I've got way too many to count and I still have no idea what to do with them all. So far the best idea is burn them all and try to create a huge hole in the atmosphere. jk So I need ideas, the crazier the better.
Save up some more and use them to make a raft on which to live. Like this guy did: http://www.banderasnews.com/0601/eden-islanddream.htm
sing it!!! 700 pointless water bottles laying around my house... 700 pointless water bottles in my house.. throw one out, turn around... 699 pointless water bottles laying around my house...
You could probably sell them to a recycling place for... like £5 seriously. So if you have nothing better to do with them..
Hate to be practical, but get yourself a home brew kit. Making your own beer is pretty easy. For 700 bottles i'd do it in your bathtub however!