Water is not comming out from tap
If your pipes are not copper or are galvanized there could be blockage due to interior of pipe rusting/corroding. With that in mind, check your faucet aerator for restrictions made from debris build-up. It would be wise to invest in a water pressure gauge so as to check pressure at several locations. Most household water pressure is between 60 and 70 psi. Also look for forgotten/hidden valves that are partially open.