I actually mix my water on top of a sink,in a 5 gallon bucket, and when its ready to get put into the tank during a PWC
, I use a hose to siphon water into a 1 gallon bottle, and then dump that into the tank. I just run the hose to the tank and fill up the bottle right next to it, so I don't have to break the siphon with every gallon. I just lift the bottle and the hose high enough to break it, dump the water in, then put the hose back in the 1 gallon, and lower it, repeat... I keep dry and it's pretty quick.