If water is supporting into multiple fixtures all over your house, it is not going to work for you to use chemicals or a small hand snake. This is proof of a blockage in the primary line, and you need to call an expert to look after this problem for you.
In cold environment locations, in some cases the pipelines in the plumbing system freeze. You can thaw them out without calling a plumber. Prior to starting this process, open the faucet and begin thawing closest to the faucet then move down the line as areas thaw out. One technique you can utilize is to cover the pipeline with a heavy towel or burlap and after that put warm water over it, set a bucket beneath to catch the water.