The purpose of this randomized clinical trial (RCT) in which subjects serve as their own control is to determine whether administration of supplemental fluid to nursing home residents with or at risk for pressure ulcers enhances collagen deposition. Specifically, this study will determine whether oral administration of supplemental fluid given daily for five days to persons with or at risk for pressure ulcers enhances collagen deposition, increases total body water, augments subcutaneous tissue oxygen, increases pressure ulcer oxygenation, and is safe.