Does anyone know if you can bring in a water canteen into the big E

Yes you can bring in water 🌊

I brought in my coffee from Dunkin donuts so figuring water canteen would be fine.

Yes you can, I have been to the Big E for 7 years and I haven't had a problem with bringing a water canteen. I hope this answers your question.

Yes as far as I know you were allowed the last time I was there.

I don’t see why you can’t … I’ve brought water bottles with me no problem ..