We've used flannels from ebay (which worked great) and have upgraded to sherpas from Quilter's Nappies - which we LOVE. I've always used a solution of distilled water, Dr. Bronner's, and a few drops of tea tree oil (natural disinfectant) which is readily available at any Aveda salon. Dr. Bronner's can be purchased online, at Whole Foods, Trader Joe's, Meijer's, Kroger's, etc. I like how easily everything wipes up, but I'm sure if you just used water and tea tree oil it would work fine. If you have a girl with sensitive genitals, you may want to consider that. Our DD gets vaginal infections very easily so we've been cautioned not to get soap anywhere near her genitals.
Also, BumGenius, Thirsties, as well as other CD companies make wipes solutions if you'd prefer a one-shot deal. These are also available online, typically through any CD retailer, or amazon, or even Babies R Them.