6.5mo seemingly not interested in nursing - help (longish)

I know it's because he's completely distracted, but I'm not sure what to do about it.  We can rarely nurse during the day without him crying.  I take him into a quiet room, the same one each time, but he still fusses quite a bit and nurses on and off.  Usually, the only good nursings we have are those where he finally goes to sleep and nurses both sides in light sleep.

We are currently cosleeping, so I know he gets a lot of his breastmilk during the night, but DH would really like for him to stop cosleeping because he doesn't feel comfortable sleeping in the bed with us.  Plus, I have a hard time sleeping with DS in the bed, so I'm tired from that and working full-time.

His eating at daycare is a disaster.  He generally won't take his bottles, maybe about 2-4oz during the day.  I go to nurse him at lunch, and even though he's obviously hungry, he still fights eating.

Finally, his stools are very hard, and he cries passing them.  I've introduced a sippy with water/juice, but he's not that interested (fine with me).  I would just like to figure out how to make sure he's getting enough fluid - and I have no interest in weaning until he's ready, but absolutely not before a year.

Thank you for your help!