If you live on a well system then can put your betta fish in the water that have?

No, do not put your betta fish in well water. Well water is often not treated with chemicals like chlorine or chloramine, which are used to kill bacteria and other microorganisms that can be harmful to fish. Additionally, well water may contain high levels of minerals, such as calcium and magnesium, which can also be harmful to fish. If you are unsure about the quality of your well water, it is best to err on the side of caution and use treated tap water instead.