I thought the same thing as well! I was terrified that Toffee couldn't drink, because the terrible aquarium that she was in at the Pet Store had the water in a dish, and she drank out of it like a cat. I actually did that, until I saw her drink from the bottle. She was just nervous about her new surroundings, so she only ate and drank at night, when we were asleep! But now she eats from my hands and wheeks every time I feed her and change her water - only after two weeks! Your cavy will be settled soon enough.