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I can't read half the posts in this thread (you illiterate fucks need to learn to write proper English), so I'm just going to give my stock response.
If you think you "only have stagnant water" in your area, then fucking look harder. I can find fresh-tasting water in the middle of the Arizona desert. I think you can find flowing water in the swamps of Alabammy.
Filters are generally fine, but they are bulky, slow, labor-intensive, and add weight to your pack (if you are hiking). They also don't filter out everything. Small microbes may still get through. You generally still need to use chemical treatment if you want to be 100% safe. A lot of filters have an iodine core to take care of this problem, but that adds the problem of imparting a nasty taste to the water (iodine), so some have yet another filtering stage where the water passes through carbon, which removes the iodine.
Boiling water kills everything 100% dead; however, it can use a lot of stove fuel over the course of a trip, and you would need to carry a larger pot than you might prefer to carry. You also end up sitting around waiting a little longer for fresh water, and have to wait for it to cool down after boiling.
Chemical treatment is God Tier. You don't even need to pre-filter the water if it is clear enough, but if the water has debris in it, simply place a cotton bandana over the mouth of your water bottle and dip the bottle into the water source. Chemical treatments that use chlorine dioxide don't impart a bad taste of smell to the water (like iodine and pure chlorine), and you can carry enough chemicals to treat many gallons of water in a small 2 ounce set of bottles, so bulk and weight are very low.
The major downside of chemical treatment alone is that you can't improve the taste of already nasty pondwater, but like I said earlier, you probably just need to learn to look harder. I guarantee you that there is a creek you are overlooking which will have water in it that tastes better.
