I am not really new to the backcountry. I am certainly not as experienced as some others, but over the past 25 years I've probably spent close to 1000 nights in the backcountry on 4 continents, always unguided. Granted most of that was not hunting, but I've dealt with stuff like hyenas and elephants in camp in Africa and mudslides washing away a trail in the Andes, so I hope that, with some helpful suggestions from others on here, I can figure out how to keep some water from freezing for a few days.
This trip is just presenting a unique challenge because creeks, wallows, and springs are dried up and there is no snow on the ground that I could melt. I cannot have a fire due to restrictions and a cold front looks like it is pushing in at the start of the season. If any one of those circumstances were different, my problem would not exist.
Carrying 40 pounds of water 3 miles isn't a big deal, at all, and is totally worth being set for the first few days of the season, in my opinion. I don't think there is anything unmanageable or illogical about a 3 mile hike with 40 lbs.
I could camp at the water but there will be wall tents there and I prefer to be away from folks, especially with the crowds this year.
Also, there is water on private within a few hundred yards of camp. Water is on private. Bedding areas are on public.