An idea. Camp in a campground a few times, relying solely on what you bring. It'll take you one or two trips to hammer out 90% of what you'll need. No need to figure it out too far from home. You can even do it in your driveway. Just camp for a weekend, without hookups or using the potable water sources and you'll figure out pretty quick if you brought enough of what you need. If you have to walk over to the spigot, or run back into the house, keep a list of what you forgot. You can even measure the water you take from the spigot if you use one gallon jugs.
A "basic" rule of thumb is that a person needs one gallon a day, for consumption/cooking and washing. Camping can waste a lot of water if you're used to doing things at home where the tap just runs. You'll need to put a couple inches of water in a bucket and use it to wash either dishes or yourself. A "spit" bath doesn't take much, but it's not like standing under a running shower head. Washing dishes takes a bit of water, but if you've done a wash/rinse method in the past, with maybe two wash basins, you'll use less.
2.5 gallons works for me, for a weekend; however, I drink a
lot of water. If you drink soda or beer, you'll need less water. If you cook freeze-dried meals, you'll need more. You can get down to a gallon a day, but it's less fun than having 1.5 gallons a day, or worrying about running out. Another thing that may work well is an Igloo 2, 3, or 5 gallon cooler:
https://www.igloocoolers.com/collections/water-jugs/products/retro-barrel-of-fun
Using a water filter like listed above (I like MSR), is a pain in the *ss if you're "camping". They work great for backpacking because they are light-weight and easy to carry, but they take a long time to pump a quart, let alone a gallon of water.
2022 Jeep JLR, manual with even more extra guacamole
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