Dwarven Scripture

In dwarvish is written:
My name is Braggor the Sturdy, member of the Stormguard. If you read this than things have gone awry and me and my family have attempted to flee the city. As this does no honor to my clan and rank, I've left my equipment behind for my brethren to use. The following riddles can lead you there, my brothers:

What is the healthiest kind of water?

I cannot lie: I cannot lay, but only lie

What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?