A sleeping system, hammock, tent, or bivy, Dyneema tarp, pillow, with a blanket or bag, pot and pipe, map, and music. Whatever food is appropriate for you, eat on the fly or bring it with—toiletries including any meds, condoms, clothes on and off the bike, rain gear, jacket, gloves (light and rain), eye protection, and helmet—no need for kitchen gear for two separate overnighters: spare battery, charger, tools, spare replacement parts/tire kit, 1st aid kit, toilet paper, cell phone. The list gets longer if you were to make it three days up and three days back. Fishing pole, more food, cook set and stove, cameras, tripod, kites, drone, slingshot, folding chair, tequila, and whatever gift you give your father. Sounds fun.
Stay safe.