Ditto Nick's post above. When I was a kid in the 60s and 70s my friends and I had some great adventures on our old bikes with no "gear" at all, other than the bike. I walked home with a flat once and spent a few bucks on a patch kit, tire levers, and a pump. I gradually built up my kit over the years with specialized tools and clothing, as my trips got longer, my skills improved, and/or I saw the need. I've never spent much money on the sport and have always had a great time.