If to you I'm given you should thankfully receive,
Then look me over carefully, just don't look at my teeth.
Show me to a cool stream and I'll follow willingly,
Though I might not do what you want, although parched I may be,
But if you're really hungry and are looking for a bite,
I don't think you could eat me even though you say you might.
Decipher all these clues and then together they should tie
To help you solve the question which, of course, is "what am I?