Seeya Gal... (Jenny and Dan) that was a great tip... that's exactly what I do... I've been boondocking most of my RV life..as with dog shows ..there was no dump .. sometimes no water and electric so you were on your own...yes, it was only weekends..but somtimes it was full weeks as we have our Specialties.... so for me.. I was on the Conserve kick from years ago..... and when I did dishes I used a dish pan.. You know the ones you get from the hospitals LOL I have several by the way... and when I was through it never went down the drain.. it always was watering someone's plants ..I mean a dish pan of water is not alot to toss....Also when it came to taking a shower..it wasn't every day.. it was every other and I used the dish pan again to wash down or you can use those Heat in the Microwave Wash cloths... but you can definitely get by without using a lot of water... oh and the black tank.. don't know how large yours is... but years ago.. my older coaches I could go for at least a week or better before having to dump.... As far as the blue dingy... I'd only use it for the gray water if I had to...don't think I could do the black tank...no...not me... Oh and there were times when we had special caps on our gray tank you could hook an old hose (Garden hose ) and run off the gray tank to a drain.. if we had too... ..ok... now that's my part....
Find out how much storage your black and gray tank have... that really helps...
I like Jenny don't drive with full tanks either..that just puts more weight on and adds to your mileage.. I still have tanks I carry to fill with water and have a pump (plastic) that I can fill jugs for the winter months in the North East..
Ok.. hope this has given you more insite...
God Bless