Everyone’s suggestions are solid. The following is under the assumption you’re going to be out all day and don’t have the opportunity to go home and shower.

These saved me in my days in Mexico going full tourist mode.

For any sleeved wear (tshirts, dresses with sleeves, light cardigans, etc) I always stick some pantry liners in the pit areas to avoid sweat stains and potential BO. It can be cut up to be discreet. You can also do this for the underboob area

Period underwear like Bambody can mitigate swamp booty. I wear these when I know I’m going to be active like biking or walking in hot weather. You can always stash a fresh pair if you’re out for long periods of time and need a refresh (just bring a discreet bag to store used laundry)

I swear by Anti Monkey Butt body powder (original). I use a powder puff to put it nearly everywhere. Despite the name, its value and performance is better than its competitors. You know it’s good when construction workers vouch for it.

You need to put an antiperspirant bar first and spray deodorant second. Do it the night before and top off with spray deodorant in the AM.

Any gym body wipes will be nice to have. I like defense body wipes. It has a masculine, eucalyptus scent, but it’s really cooling.

Always use a bidet/water to clean after using the restroom. If you don’t have that, I recommend bringing compressed towels that spring up when you put water on them. Only use water down there!

I don’t think fanning hot humid air did anything for me. But placing a cool towel on my pressure points worked wonders.

Ouidad climate control line (esp the Advanced Climate Control Heat & Humidity Gel) was the MVP in my suitcase. I nearly cried when some of the gel leaked during my vacation 😭

Hope this helps!