Is It Possible To Get Shingles From Hardly Drinking Any Water?

I just called my friend Haley & she told me she had Shingles. She told me that her Doctor said that stress caused it, but its weird because she NEVER has stress.. I don't even think I've seen her 'stressed out' before. She hardly ever drinks water because she hates that it has no taste to it, is it possible for her to get Shingles because of her not drinking a lot of water?