I droped my I phone in the toilet and now my home button wont work

@angelgirl not sure what you did about the water damage. If you have not done anything, it is pretty amazing that the only thing that is not working, is the home button. You must address the water damage or the rest of the phone will follow the home button.

First stop continuing to try to charge, sync or otherwise use your phone. This potentially can make a bad situation worse.

The very first step I would take is to disassemble your phone. Use these guides to disassemble your phone. Take a careful and close look at all components and connectors. Truly assess the damage. Look for major corrosion, evaluate the pins in the connectors etc,. Take a look at all connectors as well as cable ends. After that I would suggest that you clean it a couple of times in sterile water, not drinking water. Use a soft brush and clean it very, very thoroughly with the sterile water. You must remove all the EMI shields to properly clean your phone. Once you got the gross contamination cleaned, use 90%+ isopropyl alcohol and clean your parts some more. For a proper cleaning, use this guide. It was written for an Apple iPhone 3G but it is still pertinent to your phone as well. I can not stress the importance of a good cleaning enough, so do it over and over while replacing the alcohol after each cleaning. Do not use compressed air for the cleaning since that can drive liquid as well as corrosion particles into areas that will cause trouble later on. Do not use drinking water, if you need to use water, use sterile water. Also, you do not need to leave it to dry for a day. Isopropyl alcohol in the higher concentration will evaporate quickly and dissipate the water. The importance here is the cleaning. If you can get it professionally cleaned, do so since it will yield better results. Do not forget to replace the battery. This is a must and not an option. It will fail if you do not take care of it now. Keep in mind that water damage is the hardest to troubleshoot and to repair. Only after you do all this can you properly troubleshoot your phone. It is possible that your damage is only to the home button, you could replace it with an aftermarket one but will possibly lose the touch ID features.