How do you fix your drain withhout a snake?

One way is to use a water hose and go on the roof to the drain vent pipe(not sure on its name). Form a good seal with hands around water hose and pipe. It maybe necessary to plug off some sink drains in the house to get a good seal. The water from the hose should flow freely down the pipe if there is no problem. If it backs up (from the clog) try running the water hose till it unclogs.