I'll be visiting both parks later this week on a quick solo trip from Oregon. In the past, I would purchase bottled water and recycle the bottles when done. As it sounds like there may be some changes with bottled water availabiity with limited carts to purchase from, would it make more sense to bring a refillable water bottle? I'm thinking that is one more thing to lug around and I prefer cold water. (I'm not sure if the refillable water stations will be that cold?). Any advice here is greatly appreciated! TIA, Chris