I use a 5 gallon bucket. I don't know how much you use at a time. I put 2 gallons of purified water (room temp)in the bucket and add 2 gallons that I have brought to boiling. I mix it around with my hand. If it is too hot, I add a little more room-temp water and if it is not warm enough, I boil a little more. I like to have the water very warm, but you may want it less warm. Hope this helps.