I had a question regarding water. i have a slow running creek running about a mile back in the woods behind my house. If the SHTF and i ran out of water besides boiling it would i need to do anything else to the water to make it safe to drink? the water is not stained to bad and is a offshoot of water coming off a game reserve. would i need to filter it to? any info would be greatly appreciated. thanks in advance.