I'm going to try this recipe that other members swear by and posted on another topic:
1 gallon distilled water (or clean creek water, just no chlorines or iodines in it)
1/2 box of baking soda
16 oz peroxide
2 shot glasses of Hunters Specialty green liquid soap
Pour out enough water from a gallon jug to get the other stuff in and let it fizz for a while after mixing (about 1 hour or the top will pop off). Then just transfer to a spray bottle and you're set