I've noticed with these new mini-soda cans, the 8oz or whatever ones, that a 12 pack of them often costs more than a 12 pack of regular old-fashioned 12oz cans.

If I want a burger, fries and water, it is usually cheaper for to buy a value meal which comes with soda and just have them put water in the cup than it is to buy the burger and fries separately and ask for a (free) cup of water.