I have started using a sponge that's cut to fit into a small deli cup. I put in as much water as the sponge can hold and place it over the warm side of the tank. I make adjustments by how much polycarbonate is covering the screen lid of the tank.
The sponge helps the water to evaporate better than a regular standing dish of water. It's easy to clean, and if it gets tipped over it doesn't cause a flood or a mess.
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