You can try Pedialite, which is unflavored and uncolored since it's made for young children, or make a homemade electrolyte solution from:

2 tsp. salt
1 tsp. baking soda
8 Tbsp. honey
1 gallon warm water

I haven't been online much in the last couple of days, so I missed your original post about the chickens being sick. I'm so sorry!