Unless you ohave some medical reason not to it is always a good idea to keep well hydrated. PNers do tend to have very dry skin and mucus membranes. The extra water helps. As long as you have good kidney function is will help to rid your body of some of the toxins. If your urine is not very clear it can be a sign that you are slightly dehydrated. Also, dehydration can cause stomach cramps. Hope this helps. hopeful