I'm planning on cleaning my girl's butt feathers for when it's warm enough. They've been trapped in the coop literally all winter, and still will be in there until it's warm enough. Before I soak them I have a few questions. 1. How much water should I put in the kiddy pool? Just a little so they can lay down it in and be fine? 2. Should the water be cold or hot? Or medium? 3. Do I need to put anything in the water?