I am deathly allergic. When I was a teen I jumped on bareback in cutoffs and rode for a whole day... She had rolled in it. My legs were swollen stiff for TWO WEEKS.
And then on a camping trip I somehow got it, probably was growing next to the leaf I used... I laughed about it weeks later to my friends and they bought me that shirt
When I get in from riding or pretty much doing anything outside I grab a bar of lye soap and scrub down. I've gotten poison ivy in January.
I also carry a couple lighters, matches in a waterproof case, and A PACK OF TISSUES!!! Headlamps too, I can't tell you how many times we've been caught out hiking and had to use our phones for lights. Stupid, stupid, stupid.
If im just going around town, water, my phone, my pocket knife, a snack, and an extra rope halter and lead.
If im going out into the swamp, my rifle and my buck knife go on the saddle horn, water, poly chord, jerky, phone, small towel, extra halter and lead, lighter, compass, and a multi tool (scissors, flat head, phillips head, small knife, pliers)
Mostly I just use a little leather fanny pack to keep a few goodies in. In it there is some baling twine, some fishing gear an extra lighter, waterproofed matches, a map of the snowmobile trails in the immediate area. My phone and a water bottle is generally in there too and my leatherman.
If I'm going for the rare long ride I have bigger bags I can put lunch and a sweatshirt in. Even a small tent if I really lost my mind. But I like that warm bed and shower thing.
I'm not much of a fisherman but I can catch food with it should the horse and I become separated. I can either fish or fashion a snare. Can make a fire for warmth or signaling help. Baling twine has loads of uses. I'm also a bit of a plant geek so I'm aware of the edibles out there.
I always have my fanny pack on me. In that I carry cell phone, small can of bug spray a bandana, a whistle, leatherman tool, lighter and parachute cord. My husband suggested I carry the pistol but, I told him if I ever needed that the horse would be leaving me in mid air and when I hit the ground the bad thing would get me anyway. Usually I have a bottle of water in there too with one in the saddle bag and treats for the horse. Think I will add some duct tape for the next ride.
I have only gone on day rides - but I usually carry jerky, apples for me and my horse, gloves, band aids, medical things for my horse, extra leadrope, treats, cell phone, hobbles (my horse loves to paw when I eat my food.) and of course water.
Right now that is all I can think of. I usually just put them into small ziplocks and organize them in my saddle bags so I know where to find everything.