Can you bring water bottles like a hydroflask or a yeti or does it have to be an actual water bottle?

You can bring whatever

Yes

Yes you may bring any water bottle you like.

Just ask for water. They will give it to you for free. There are also water fountains you can fill up to.

Water bottle is a must, weather u take your refillable or take a plastic one to refill at the free water refilling stations!

Any water holder is good. I brought one since water and ice were free.

Yep

Yes you can

Yes, you can bring water bottles.

Yes you can. I brought my yeti can had no issues.

Technically, I believe you can only bring in one sealed water bottle per person or they could turn you away. It's in their rules and/or FAQs.

They don't seem to care

I believe so

Yes, we brought in Yetis.

I saw guess with personal bottles

I brought clear spring water bottle all the time.

I took plain water bottles in yesterday.

In the rules it says you can only bring in “one sealed water bottle per person” but they are not very specific, so I think it’s fine to bring in a plastic/metal one.

I've brought them in empty and then filled them at the drink stations.