Can I use more than one Water during the course of the day?
You may use as many different Waters as you like during the day, as long as you allow a minimum of one minute to pass between the use of one Water and another.
How often should I use a particular Water during the day?
You can use the Waters as many times as you like during the day. Trust your intuition to guide you. If you're uncertain, one guideline is to use it every time you become aware of the issue you are currently working with or to use the Water every time you see it or think of it.
The refrigerator (icebox) is the best storage place, especially for those Waters that are seldom used. If the refrigerator is not an option, make sure the Waters are stored in a cool place, out of reach of direct sunlight.