What is wrong when all of sudden no water is coming out of all facuets or shwoer heads?

You have most likely clogged aerators. Aerator is located on tip of your faucet spout. Remove it, clean it, run water through spout w/o aerator and then reinstall it.

Shower head has a flow restrictor built in. Remove shower head, look inside the threads inside shower head. You will see small restrictror. You can etiher remove it completely and toss it or clean it and reinstall.

Are you on a well or city water? Does the toilet fill Ok when flushed? If Milos solution doesn't work out you'll have to open the valves, check and clean the inlet ports on the cartridge and flush out the valves and their supplies. Good luck, Tom