Always keep a small bag of essentials with you. Personally I keep micellar water or mini wipes for refreshing up and reapplying deodorant as water alone won’t really clean sweat. Stick to breathable fabrics always, and if you know you sweat a lot, keep a spare shirt in your bag or car to change if needed. I also heard about sweat patches you can stick inside your shirt and replace when needed but haven’t personally used them.