You can use an medical set-up but your oxyger level will eventually get to high and the fish will die. You will also use a bottle up real quick. Go to a welding supply store andtell them you want a regulator that puts out 30 ???. That will give you good oxygen rate. If you don't mind spending the money, check out Showdowntackle.com. He sells a good set-up. I have built a water cool-down system but not ready for fishing tournaments yet. I took a 48 qt. cooler and put a A/C coil in the bottom and copper lines running out the side connected to a minnow bucket prayer. Fill the cooler with ice and have the water from the live well running through it. Keeps the water around 64-66 degrees.