If you are on terminal B or E they are behind those immigration lines...below the flags
There have a lot of water fountains I airport.
There are water fountains after security, so you can refill there for free
ðŸ˜ðŸ˜ðŸ˜
There aren't any designated water bottle filling machines, but there are drinking fountain all over the airport, hope that helps!
Thanks! Your answer is awaiting moderation.