I just finished a lite tour, doing some camping coupled with a few hotel stays due to the need to dry out some things after riding through some very heavy rains. I wound up being out for 5 days total and did just over 300 miles at a nice tour pace. Temps hit 90's in the day, 70's at night. Basically across WI then south in IL and home. This is all fairly well populated although my route was still very rural. I encountered 2 segments though where water was pretty scarce as well as food. I did not plan to cook due to the proximity of towns along the route so I only had some Clif and Pro bars with me. I got a bit dehydrated one time and both times I was ravenous by the time I pedaled into a town. I checked my route before leaving but some of the places I expected to be there were closed down so be prepared.
I used a Tarptent's Double Rainbow, Snugpak sleeping bag, Neo Air mattress and my deluxe camping pillow. I carried 2 water bottles plus a Platypus 70 oz collapsible bottle. Couple pairs of shorts, couple jerseys, coulpe pairs of socks, shorts for around camp/hotel and a few T shirts. Used Sanuks for shoes when off the bike. I carried a XPAL 2000 to keep my Edge and phone charged up when no current was available. I carried the usual patch kit, spare tube, multi tool, pocket knife, chain link, and small rolls of Duct and elec tape. I brought a stretchy clothesline which wound up being very handy for drying stuff.
My only issue in hindsight was not stopping to fill my water containers EVERY time I could. I figured there would be more chances down the road. There was, but the distance between them was greater than anticipated. Lesson learned.