I learned to dry camp when I went to what I call a..... "half and half" campground. I found this lovely but VERY REMOTE campground in Washington State. You could only get electricity between 8:00 AM and 8:00 PM, and it was from a generator in the campground. After 8:00 PM, generator off, you are on your own.
Also, along I-84 on the WA/OR border, there is an exit in Rufus, OR, where there is some BLM land on the Columbia River that you can dry camp on. I will only stop there if there are at least 3 RV's there. Find something like that, and ask others if you need help.