What would you do if your kids aren't handling Manila summer well? Any tips on how to help then get through this heat?

During hot season,i make sure the room has good air circulation and not too stuffy. Open the door and window in early morning but close them before 9 am. We don't use aircond, so my kids take shower at least 3 times per day and wear cotton thin clothes. And it is a must for them to drink regularly, so i have to remind them that every hour.