First, you need to know what your well is capable of. If you have a recirc, great, that helps. But if your well is always bringing in new lake water, you could be wasting your time with many of the tips here if you try to do both. Think about it, you cool your water, you add more O to the H2O then you turn on your pump and it brings in new water and the treated/cooled water exits your overfill.
If your well is set up to bring in fresh, then you need to decide. Do I bring in fresh more often, or do I treat and hold the current tank full. I'd go with the second option. Do what many have said here with the addition of a bubbler and some ammonia blocker and you'll have some frisky fish when you let them go and save on batteryfrom not running the water pump. A bubbler will do two things for you. It will help add oxygen to the water and it will help dissipate carbon dioxide. ammonia is a byproduct of breathing and pissing and it add up to a killer. There are simple formulas you can get at the pet store that will block it and make it harmless. Cooling the water is essential if you want it to hold absorbed oxygen from any source. Salt, or a fish saver formula (that will mostly be salt and cost you 5-10 times as much) helps calm the fish, protect the fish, and also helps the water hold more dissolved oxygen. If you add a bubbler, cool the water and block ammonia. you won't need to recirc or add hydrogen peroxide. You can if you want, but that would be plenty.

Us striper fishermen have been keeping much more delicate bait fish alive in hot summer months for a long time and the principles applied there can be exactly the same for bass with some minor adjustments.