Doesn't matter how big or small an incubator is, I always would recommend putting some water bottles on the bottom. We don't ever put eggs that close to the bottom anyways because temps could be a hair off if perhaps the incubator is sitting on the floor.
We have walk in incubators with shelves on both sides and we lined the bottom with gallon water jugs. Again, it's mostly for stability reasons and keeping the heater from not working as hard. If you have a tall incubator it might be worth while to put a small fan in to circulate the hot air around.
Good luck if you plan on building one, they aren't too hard
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