It's warm and toasty in here - although that could be the water bed. The carpet on one side of the room doesn't match the carpet on the other side of the room. One side is green, the other is blue. There is a desk and a bed and matching closets.
The forest is sort of medium light. Not too dark but not bright either. The trees are all scraggly jack pine. Tall and skinny.
The path is well travelled but there are a lot of less travelled side paths off to the side. There are a few bumps and trees across the path, though, so it is not easily navigated.
The water is a spring coming out of the side of a hill. It's a natural spring but there have been additions, a platform to stand on, a pipe to guide the water. The water itself is pure and clean and cold and crisp. No chlorine, just nature.
The vessel is a jug. A big jug. You might drink out of it but it's pretty heavy when it's full. More likely, you would take it home and use it to fill smaller jugs.
The key is one of those big skeleton keys that they have in B movies. Large and brass and designed to be left in the lock of a drafty castle somewhere in Northern England. I think it unlocks the door to the secret passage way.