Slip and fall in QFC,. I need advice on how to proceed with lawsuit.

I slipped in water that I couldnt see. There was no indication that the floor was slippery with signs. A male stocker (hispanic and spoke no english) failed to recognize me when I fell and then told him there was water on the ground and I fell. He didnt even look up at me. When I got the manager, he proceeded to offer me the chance to file paperwork, which I did. The manager filled out the "customers description of incident" and had me sign it.. He left out how the stocker failed to be cognizant of the 3 foot puddle. Before any pictures could be taken of the area, the stocker proceeded to clean up the area and put down a warning triangle. I wasn't badly injured, went to the emergency room to find I had a pulled groin muscle, twisted ankle and a pulled back muscle. Where do I go from here?