Water tip.
No matter how irritating it may seem, don’t take for granted the reminders given to you by your friends and family regarding your trip. If they constantly tell you not to drink water from uncertain sources, don’t. You’re not a superman to deflect bacteria (I guess even superman can’t do this!). Buy loads of bottled water. I know that may seem a little of a hassle for you, but there’s nothing better than having a real “safe” trip.
But, if you are really that hard-headed, or perhaps you’re journeying on a tight budget and wouldn’t want to spend a dime for bottled water, then you can use tap water instead PROVIDED THAT you boil it or drop an iodine tablet on your glass before you drink it.
Photo taken from http://www.treehugger.com