The guinea pig's name is Colonel Fitzwilliam but the kids call him Fitzy. My wife is an English Teacher so she gets to name him...
My first question is about his food.

Secondly, the water bottle that came with his cage seems to be working and he works on it often like he's drinking, but it does not appear that he's getting much water out of it due to how much water remains in the bottle. How much should he be drinking per day? I ended up putting a small bowl with water in there with him because I worried about him getting dehydrated. However, he seems to be peeing a lot (normal, I guess?) so I assume he's drinking.
Lastly, we've had him now for about two weeks. Yet he seems as scared of us as he was on the first day. He's constantly startled when we go near his cage. Is this normal also? I figured he'd start getting used to us. We've tried to all go and speak with him while he's in the cage and when he's out. But he just seems so terrified all the time that it's kind of sad... We have debated on getting another guinea pig so maybe if he had a buddy, he wouldn't be so afraid.
Anyways, thank you for your insight!