How much water do you use a day? 
Best guess:
Water tank ? ................................About 1 gal to wash and maybe 1 gal to rinse dinner dishes, utensils, & pots/pans (more or less, depending). I don't usually have a fancy breakfast or lunch; so, spoons, sandwich knives, etc from breakfast & lunch are usually wiped clean and remain in the covered sink to be properly washed with dinner dishes. (Sometimes, breakfasts are cooked ahead ...pancakes dusted in powdered sugar; homemade granola, hard boiled eggs, etc....and packed in sandwich bags for the camp trip.) The same individual cup and filtered water drinking vessel are used all day and washed in the evening.
Drinking water?.............................About 96oz for the dog and I (more or less, depending.)
Total per person per day? ....A person is supposed to drink at least 8 glasses of water (64 oz) per day.
Water saving techniques you would like to share?...... Hospital-style body wipes if no showers available. Lysol wipes for counters, floors, etc. The cooking pan is filled with soapy water and warmed and the dishes, etc are washed in the pan, followed by a light rinse in the sink. I attach a small piece of tubing to the faucet so that the rinse water can be directed on the object being rinsed, using a very minimum of water. No potty water is needed for a Luggable Loo with proper gel crystals bag insert.
Paper plates ( I don't use them)............................. Occasional 1 or 2 plates; but, mostly not used at all.