1. A liquid that grows as soon as it is tipped up 45 degrees. This way when they go to drink it the water grows. The problem with this is mass can not be created and that is what is happening. Let's go on to one that might actually happen.
2. A liquid that is SO thirst quenching that you only need to take a very small sip and it would be the same as drinking a can of soda. Problem with this though is that you wouldn't actually be able to intake enough liquid and could be hazardous to your health. Another is that you would actually run out, but it would take a very long time.
3. Sort of like 2, but a little different. You take a gulp of this liquid and it SLOWLY breaks down. Hard to explain, but think of it as ice. Ice slowly melts and if you were to eat a huge piece of ice and it melted a a certain rate you would not get thirsty. MY idea is you take a gulp of what i would call, ICECECAL, pronouced Ie-sa-cole, and you wouldnt not have to drink anything for as long as two-three days. The problem is it would actually run out also, but for 2 and three you would buy big things of it like a water cooler and dispense small amounts for 2 or one big amount that lasts 2-3 days for 3.
I think this idea is very original if i do say so myself


