Hey sloppyj03, the one thing I can say is to put some foil loosely over your cup in the water bath and push the center down. That way when the alchol evaporates it will drip back into the cup and you should not have to add more. I don't really seem to lose any for the 20 min or so it is in there. And I use a digital meat thermomitor stuck through the foil to monitor the temp. I also like using a small crock pot for the water bath instead of doing it on the stove. It seems to keep it at a very consistent temp.