The purpose of this study is to determine whether providing extra fluid to nursing home residents will help prevent or heal pressure ulcers. We hypothesize that providing extra fluid to nursing home residents will increase their skin blood flow and oxygen to support healing and maintaining healthy skin. Participants are enrolled who have a pressure ulcer or who are at-risk for an ulcer (determined by looking at risk factors). The study is divided into two 10 day phases. In Phase 1, we examine participant's usual status, including fluid intake and baseline healing potential. In Phase 2, participants are randomly placed in groups to receive either their usually prescribed fluid intake or additional fluid. A study nurse provides the fluid to the residents. We measure their actual intake, their body water, how well their kidneys are working, their potential to heal, and also monitor them for the development of fluid overload. This study is important because it helps us understand the role of a basic nursing intervention in the prevention and treatment of pressure ulcers.