Just contact your bank and open an HSA account with them - they'll fall all over themselves to help you do it.

It will be interest bearing and you can tie it to bill-pay and issue mailed checks directly out of it. It's great.

Also, you can leave unused HSA funds in the account and let them grow, tax free, for future medical needs.[1]

[1] https://www.irahelp.com/slottreport/how-you-can-utilize-hsa-...