My toilet isn't taking in any water, and when I try to flush it, it is very weak and quick. Even if I fill it manually, it doesn't flush well at all. Help!

You may have some crud in the fill valve. Take it apart and clean it.

Note, I am asking to have this moved to Plumbing.

If you have a float ball and rod ballcock shut the waqter off and remove the three screws and pull the float ball and stem assembly up and out. Place a pan over the open ballcock and tureo9n the water to flush out the supply and valve, You should have a strong stream coming out o9f the top. IUf not click on back. If so then reassemble the ball cock and let's move on to your slow flush. I have one that most repair plumbers miss.. Look down at the bottom of the bowl. If there is a small hole, then that is a jet that starts the syphon action. If it's clogged the water will just swirl around and slowly go down leaving solids behind. Take your finger,(UGH! ) and run it around the inside of the opening. Over the years minerals build up and cut down on the syphon (flush) action. If it is rough or you feel build up, take a table knife and put a bend in it to get around the curve in the bowl and chip and scrap it clear. Next take a coathanger and clear out the holes around the rim. They start the swirling action. And last, check the water level in the tank. It should be 1/2" below the top of the over flow tube. And speaking of the overflow tube, Make sure the small 1/8" tube from the ballcock to the white overflow tube is connected so it discharges in it and that it's flowing when the ballcock fills. This is what raises the water level in the bowl. For a good solid flush they all have to work together. Hope this helps . Tom