Sanitary water

1 L Tap water

30-60 ml 3-5 % peroxide solution

Mix in a jug.  Read the MSDS for hydrogen peroxide and follow all safety precautions (wear gloves, rinse thoroughly if you contact the hydrogen peroxide with water).  Let sit overnight.  Use for misting and wetting fruiting kits between flushes.  If your tap water has high chlorine content, use distilled water instead.