I guess it is how you look at it. We primitive camped for 20 years before the trailer and the 60 gallons of fresh water we can take up looks like a swimming pool. Two weeks is easy, three weeks possible but we will run out of food. Our first week in the boonies we were so conservative that we only showered every other day and brought most of the water home. We have loosened up considerable and will only bring ten gallons or so home after two weeks.
Most of it is tricks like already listed, but the important thing is never to waste it.
When we run the hot water, a pot collects it until it comes out hot. That water is used for the dishes. Dish water is used for the toilet or to put out the fire at the end of the night.
My shower is a modified sponge bath with a navy rinse and the flow is low enough that the pump pulses. I don't collect shower water for flushing, I just pull a bucket off the grey tank instead.
When we wash the dishes the collected water is heated. We could use the hot water already in the hot water heater to wash and the collected water to rinse but that is wasteful. We start by washing the silverware in a cup with one drop of dawn. The water from that cup is passed to the next until all the cups/glasses are done. The silverware goes back in a cup and rinsed with hot water and that water is passed to the next cup for rinsing and so on until it starts getting sudsy and put in the wash tub. The now hot sudsy water in the tub is used for the plates and lids, those have to be rinsed in the rinse tub and a cup recollects the water until sudsy. By rinsing with hot water and adding it to the wash tub when sudsy, we always have clean rinse water and by the time it comes to pots and pans, there is plenty of hot soapy water to do them with. The last items are rinsed in the rinse tub so that when we dump the wash tub, it can be rinsed too.
One thing about using waste water to flush, I still use a bit of fresh to rinse the grey water down.
We use disposable gloves while cooking so that we don't have to wash our hands every time we touch the food. It's easier to just change gloves.
There are other things that we did while tenting like bagging the toilet or using a spray bottle for washing but we don't have to anymore. That's why we bought the trailer.
