Always have your iphone 5 car charger with you. Iphones are known to use a lot of charge. When traveling, you need to have your iphone with you, always. However, it will not help you if it doesn’t have any charge. Have the charger to help you charge it whenever the need arises.
If you eventually get your iPhone moist, the very first thing to do is to power your phone down. Don't try and make calls to see if it works. Don't try to boot it on when it is not on. This could cause a power short, which may make the situation worse.