Can I use a regular 5 gallon Culligan water bottle to gauge my 5 gallons of water for the boil? I have been using them to make ro/di water for my reef tank for about 3 years now. I'm going to be breaking down the tank and thought I could use these bottles to make more water and use it for the boil. Also, can I just sanitize it by using star san and filling it then dumping it onto another bucket to use the same sanitized water for all my equipment on the boil day? Is ro/di water ok to brew with, or would it be to pure?