How to clean water?
The best way to clean, or sterilize water, is to filter/purify it. Getting a high quality water filter is a good investment. Make sure it can be portable, in case you do a lot of camping etc. Simply boiling water, or adding chlorine, may not provide enough sterilization. But it may be enough, if you don’t have immediate access to a filter. There’s also some water sterilization tablets you can buy, to sterilize water in an immediate need.