The best paper I ever used was cheap type writer paper but I can't find it anymore. The next best thing is the greyish newspaper paper like what is in little kids learn to write tablets. We called them Big Chief tablets but there are lots more brands that will work & are cheaper than the old Big Chief. I found a couple reams of it without the lines at a flea market so that is my current method. It is just like the Carol Doak paper which I had a sample of to compare against.
The paper from NCR forms is also fairly thin. You are looking for the thinnest paper you can get that will still fit through a printer. It will jam more than regular paper so I always use the manual feed tray and feed it one sheet at a time to force it to go slower. I use lazer printers, though. For inkjets, you might not have that option.
I have used plain old cheap copy paper lots of times also. My trick to working with it is to pre-crease all the sewing lines. It weakens the fibers & makes it easier to sew through & remove. I tried spritzing with water & ended up with a mess. I was having trouble seeing the lines on the reverse side to place the fabric so started creasing them and discovered the creasing had an unexpected bonus side effect.