Off Familycare is what I used at Anthony's key the last time I went. It worked exceptionally well, I don't remember a single bite. We saw others at the resort who had not used bug spray and they were literally covered in bites. It looked pretty miserable.
Off familycare is a deet based bug repellent, but it's a little weaker than deep woods off. It smells a little more pleasant and feels a WHOLE lot nicer on your skin. It runs about $6/bottle here in the US. Amazon:
https://smile.amazon.com/OFF-FamilyCare-Insect-Repellent-Smooth/dp/B005MGRMZS (same price at local stores usually)
Anthony's key does sell bug repellent in their little shop. It was some brand of "environmentally friendly" stuff (no deet). A lot of the folks who were with our group when I was there used this stuff and said it worked pretty good.
Batteries. Bring batteries if you have anything that takes them (AA, AAA, C, D, etc). We ran out of AA batts and the camera shop sold out the second day we were there. I wish I had brought more batteries.
Medicine. Although AKR does have a medical facility with a re-compression chamber onsite, they do lack for basic OTC medicines. Antacid, cold medicine, seasickness meds, etc.. bring your own. We ran out of something (I can't remember which of those, probably antacid) and the shop didn't have any for sale. Also their medical facility didn't have anything. Luckily another diver had some and helped us out.