The Magic Mushroom Grower's Guide includes instructions for adding more water to your rice cakes after you've grown several mushrooms
in order to keep the cake flushing longer. Here are two recipes for "water substitutes" which may help you get even more
out of your cakes by replenishing their nutrients as well as their moisture.
1 part Purina Dog Chow (any brand will work, as long it´s a "dry dog food")
5 parts water
simmer for 1 hour, adding water as necessary
Use this "Dog Food Water" as 10% of the water for injecting into your cakes (dilute 1 to 10 with water)
Use a 10% dextrose solution as water for PF cakes.
Dextrose is available at diabetic supply stores and brewing stores.