Contact nappers and co-sleepers, how are we staying hydrated?

My LO is a contact napper and co-sleeper, 6 mo so currently doing 3.5 hours of naps a day. I'm high hydration needs, even a tiny bit of dehydration and I get headachey and my milk supply instantly suffers. During the pregnancy I had to drink 6L a day to not faint after a hospitalisation taught me the hard way 🫠 Habitually, I'm really good with my water intake, have a massive 2L bottle which I carry around everywhere with me, so it's not a habit issue I have.

But if I do a big drink in his wake windows, it almost always hits during a nap, even when I do a tactical loo trip beforehand.

If I sip a little constantly throughout the day, it hits during a nap.

If I wait until overnight, it hits at literally any point all of which are inconvenient with him on top of me.

How tf are you drinking enough fluids?