As painful as losing your Grandfather is, you'll always have the comfort of knowing he was cared for. He stopped eating and drinking because he was dying, not the other way around. Nobody was arrested for trying to put ice chips on his lips. Some people try to switch the meaning of dying naturally with being murdered. Up is down, and down is up. You know better, and you were there for your Grandfather. He got the care that was best for him.
Yes, no one was arrested for putting ice chips on my grandfather's lips. We all took turns putting a wet washcloth in his mouth so he would get some drops of water while dying. It is a shame we live in a world where putting a moist towel one someone's lips would get us arressted.