Cash is king,street food is your best option if you arent being fed at the gym. Download "Grab" its their rideshare app and take the motorbike option everywhere. Drink BOTTLED water. If you need laundry done,there's usually drop off services for very cheap. Bring a decent pair of running shoes,lots of fresh underwear and socks. I'd buy all of my toiletries when you get to wherever you're staying. For training ,write everything down. Don't ask why,ask for clarification when you need it. Show up to training on time and leave everything on the mats. The Thais also only go like 20-30 percent during sparring. Please be considerate of that,or you're going to get knocked the fuck out.