Oxygenated water and juices oxygenated at home

Hi, I’m interested in using oxygenated water for drinking and other purposes. I have found bottled oxygenated water at Whole Foods Market at a moderate cost, at health and nutrition stores and online where the cost is quiet high. I think it would be great if I could oxygenate my own water, fresh juices (a gallon or so and refrigerate it) at a very reasonable cost. Surely oxygenating equipment for this purpose is made by some company in the US. Has anyone here ever done this and can anyone tell me where I can buy oxygenating equipment to oxygenate my water/juices/bath water/plant water at home? Thanks.