I want to put some probiotics in my chicks water, however I only have 4 and I water them with a standard size mason jar screwed into a chick-sized watering base. Can I mix up a gallon of the probiotics like the package says, and then refrigerate the rest? If so, how long would it stay good in the fridge? Or, does anyone know how much I should put into a mason jar full of water?(ex. 1/8tsp?) Thanks!!