I am currently out of the country and I am ACE certified GF and Red Cross WSI.
I’m surprised how many online courses that there are for aqua fit! Perhaps google, like I did, and then read into the details of each cert so you can understand the price, the timing, and the renewal requirements of the cert. I didn’t go to that level of detail, but there seem to be several choices.
I googled: “aqua fitness certification online”