Couple of questions for anyone who has been to SVI and Vieques

1) We are hoping to visit Mosquito Bay on Vieques to see the bioluminescence. There seems to be surprisingly little info from cruisers who have also done so. I am curious if most anchor off Esperanza and use a tour group or try to anchor in Sun Bay and dinghy around on their own? I suppose one could anchor just outside of mosquito bay entrance but it looks like a relatively unprotected place to spend the night.

2) Is there any reliable place to fill up with water in Culebra? Look like very little in Vieques and not sure if I want to head all the way to Puerto Rico to get water.

3) Any advice on good diving locations in SVI?

Thanks in advance!