My 2 month old puppy is having trouble urinating and having a bowl movement she walks around in a hunkered position like she has to poop but doesn't she has been drinking a tremendous amount of water today then will pee in little streams she seems to be in pain

Sounds like it could be bloat.

Find out where the emergency vet clinic is.

Take her.

Now.

It can kill within hours.

What kind of dog is it?
Bloat crosses my mind, but it's pretty rare in 8 week old puppies..
It could be any number of things, but please call your vet now. If they do not have an after hours service, call around. At least talk to someone.