I went with a Kirkland Brand gallon jug. I asked security about my water if it was fine.
The only reason they said no was because it was open. Not because it was too big or impractical. It was unsealed. So if you go with a large group and don't wanna pay $6.99 for Dasani. Take some hugs of water. It was only a waste of $1.25 since I drank most of it