I have 5 Runner ducklings. They live in the back room of my basement in a blow-up pool that's about 5'x10'. I keep the house temp at 77* but they also have a heat light that's about 3.5 feet off the ground on one side. I work at a hospital, and get the unusued, but no longer sterile, drapes from surgery to cover the bottom of their area with, and I change it daily. Their food is non-medicated chick starter from Stockdales, and I fill up a mason jar-sized bottle once a day for them and use the round feeder with the holes for them to get food. Their water "bowl" holds about 1.5 gallons, and is a basin from work. I clean and empty it 1-2x daily, depending on how dirty it is. I have a piece of plastic grid (like for a flourescent light) covered with a towel under their water so it doesn't pool too badly, or get slippery. I also give them finely chopped greens every few days in their water if their food is empty later on in the day (I've read multiple places that it's better not to give them free-feeding 100% of the time after the first week). They do LOVE to "torpedo" through the water at bath time (they've only had 2, and both were this week).
Here is the video of part of their bath time last night-
Thanks!