dropped my galaxy s5 water. Now it will not turn on

@thankyoulord this is going to be difficult. Unless you get the motherboard to a point where you can turn your phone on, there is no way to recover the files. I suggest you start from the beginning and give this a try.

Remember do not try to charge, sync or otherwise use your phone. This potentially can make a bad situation worse.

The very first step 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 (this will flush away some gross contamination). Use a soft brush and clean it very, very thouroughly with the sterile water. You must remove all the EMI shields. 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 a 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. The best cleaning of course would be with an ultrasonic cleaner, so consider to get it professionally cleaned Do not forget to replace the battery. This is a must and not an option. After all that, reassemble your phone and re-evaluate. Keep in mind that water damage is the hardest to troubleshoot and to repair, but at this point you do not have anything to lose.