Good Idea: DIY - Ice Packs using Liquid Soap. Save money on buying ice packs by taking dish soap, pour it into a ziploc bag, then freeze it. The soap doesn't solidify so it molds to the shape you need, it gets colder and stays colder longer.
I already use diluted tea tree oil and my own lavendar for cleaning everything from me to the bathroom sink. These are some terrific recipes for homemade cleaners: Anti-Bacterial Spray, All-Purpose Cleaner, Grease Cutter and Bathroom Cleaner.