Bali belly scuba diving?

I want to go to Bali to dive next year but seriously the thing putting me off going there as a whole is Bali belly.

It would only be like a 4 day trip so I reckon I can get away with not eating anything dodgy in that time, but how do you wash your gear? Would you wash your regulator with bottled water? Is the sea water defo safe to dive in? Sorry for stupid questions, I have pretty bad anxiety🥴

How have you prevented getting sick, is there anything that wouldn’t usually be considered?

I’m thinking wash everything except mask and reg normally.

Thank you :)