If you do buy a trash can to haul the water in, I HIGHLY recommend getting a Brute trashcan. They are built tough and will not collapse once filled with water (even while rolling it around or throwing it into a truck filled with water). I have seen cheaper ones buckle once filled with water. If you got the extra money, get the caster set too for it. Its a life saver. Plus after the move, it works great for storing RO water or using it for water changes.

As for the water, you could probably find a distilled water dispenser at a HEB OR just hit up a LFS. Most LFS sell RO/DI water. Some even have it premixed with salt.