Water bottles are allowed inside The Art Institute of Chicago. You can fill up your bottle at the water bottle filling stations that have replaced all the water fountains. Bottles should be kept safely in your bags when you are in the area that houses art. The museum will give you a bag if you don't have one.
Can I take pictures in the galleries of The Art Institute of Chicago?
Taking pictures of the collection and special exhibitions for personal use is permitted. Non-flash photography is allowed in all the permanent galleries.