Milk, and not just any milk but Lon Lon Milk. It does the body good due to not only it's delicious taste but also restoring up to five hearts a gulp. I can see it now, I would be watching some tv or using the computer while I could use my iPhone to shoot a bottle of Lon Lon Milk over whenever I get thirsty. I would also put the milk in plastic bottles so they wouldn't break if I dropped them.
Now I just need to get an iPhone, and one of those Cannons, and some Lon Lon Milk. Too bad I live no where near the Lon Lon Ranch.