My DD had been to Europe, Fiji and Bangkok by 12 months old.
It's totally understandable to be worried about hygiene.
I overdid the cleanliness when we were in Bangkok. I'm sure I seemed like a druggo with the amount of sterilizing tablets and solution I took but I'd put some tablets in the bath for her and boil bottled water for drinking etc. she was never sick.
we were in bali last year and you can take squeezie pouches of food or buy them at the local shops there too...plus formula and nappies, sure things cost a bit more but everything is a available.
We got married in Fiji and although I didn't have kids then, of those that did some used nannies some didn't. A wedding abroad is more than just "the wedding night" it's a groups of people together celebrating for days so if you or your husband missed a few hours of the wedding, I'd prefer that than to miss out totally by not going...or miss the joy of holidaying with your little one.
Good luck with making your decision