I can vouch for Moodene's syringe idea. I've been using it since day 1 and I couldn't imagine doing it any other way. I have a 10 ml syringe (which actually holds 12mls) and some aquarium tubing from the pet store. I add 12mls anytime the humidity drops below 25%. That is usually all I need to add each day. It's great to not have to lift the lid to add water and MUCH simpler than taking all the eggs out if you need to remove water.