What is the best Livewell additive to buy to keep fish alive?

G juice liquid. 1/2 oz treats 30 gallons. i save 32 oz. Gatorade bolttles. Peel labels off.!Pour 1/2 oz. G juice in each one, fill with water, throw em in freezer. In hot summertime tournaments I take 4. Put em in my cooler compartment with my water & drinks. 1 small bag of ice. When i or partner catch first fish we take lid off 1 & put it in livewell. Helps cool water & releases into livewells. Add another as needed for livewells water. Convenient & easy. Just make sure to tell partner NOT to drink the blugreen Gatorades without labels. Helps keep my drinks cool & fish treated & cool too. I buy the big Quart size about once a year. Its much cheaper that way & I get 64 frozen bottles for use out of it.

I ALSO added the VT2 livewell vents on livewells lids. This alone gets rid of the ammonia buildup in livewells which kills fish. In conjunction with the frozen G juice bottles, my fish STAY healthier.

Thanks for the information