Visiting Family with my RV

I will be spending the Memorial Day weekend with family, so my camper will be parked in their driveway.  LOL.  My fur babies don't get along with theirs, so this way I can visit and we have our own place.

My question is.  I will only use the facilities at night for getting up to pee.  What do I need as far as water goes?  Can I put water in my water tank and just use that for flushing and washing hands?  

I am not sure what I am going to need to do?

Thank you so much for the help.

Now, for some other useful details. Get a good biological treatment for your tank. Never use one with formaldehyde, especially if it needs to be dumped in a septic tank. TankTech's Rx, Unique Products RV Digest-It, Happy Camper, and others are good choices to use. When you use the toilet for #1, it is not an issue. However, for #2, the key is lots of water. Fill the bowl about half-way. Cross some paper over the top of the water. When you are done, add more water and then open the valve quickly to let the waste drop into the tank. The extra water and the biological treatment will help break down the waste and paper so when it is time to flush the tank, it will flush out more thoroughly. Also, don't be in a rush to dump the black tank. Let it get about 2/3 full before you dump. The volume of contents will help flush out the contents also.

The fresh water tank should be sanitized before you use it. Add about 10 gallons of water (no need to be precise). Add 3/4 cup bleach (make sure it is just bleach, not the ones with detergents). Then fill the tank the rest of the way. Run the faucets until you smell chlorine, starting with the ones nearest the tank and moving to the ones farthest away. Don't forget the shower and outside shower if you have one. Top off the tank. Also, this should include your water heater. The chlorine won't hurt the anode rod. If you intend to use the water heater, it needs to be filled and sanitized anyway. Let this sit overnight (or about 8 hours). Drain this water. Fill the tank with fresh water and flush this through the lines to purge the sanitizing solution. You may wish to drain and fill again to minimize the chlorine taste. You can also use some baking soda dissolved in water to help when purging the chlorine sanitizing solution. Once that is done, your tank will be ready for use.

Have fun driveway camping at your family. I've driveway camped a number of times.

I purchased 3 of the 6 gallon Heavy Duty Water Containers.  

https://www.amazon.com/gp/product/B00336SBUE 

Can I fill these, put in my car, when I get to my family's house, can I fill my water tank and use that water?  The other question is, if I do, and I don't use it all, now I have to drive with that water in the tank.  Is that a good idea?

I have watched many of John's videos.  I will watch the dewinterizing one too.  The people I bought the camper from had winterized it, so I will have to dewinterize it before it's voyage Memorial day weekend.

Thank you so much.

Pearl

New York rules may be different. If anything, I would expect them to be more stringent than North Carolina's rules. When I tried to find information about it, I could not find information about residential use of grey water and commercial use required that all grey water be filtered through sand or diatomaceous earth before going into a storage tank. Thus, I would not dump grey water on the ground.