Look at it this way, you will have a beautiful tank and be in the best shape of your life! Just remember that water weighs 8.8 lbs/gallon so make sure you can carry the bucket.
Your
LFS may sell water jugs. If not, the 5 gallon water containers that you buy for camping work well. They have a handle built in to make it easy to carry and are designed so you can pour easily. Make sure that whatever you buy is labeled for potable (drinking) water.
