Love the avatar. First of all you are in a good place mentally right now. However, don't overwhelm yourself. Start with one avenue of interest and
learn a decent amount about it. until you are at least satisfied you could pull it off in a pinch(water filtration, or small farming/cultivation for
example) Don't try to be an expert at everything. Then actually practice what you've learned. Buy a good filtration system, and use it on a camping
trip. Plant a small garden. Get a field guide to edible plants, and then take a walk in the country, and collect edibles, and learn to prepare them.
Take self defense classes, and get physically fit if you aren't already. Do it all one step at a time though. Devote a couple of down hours a day to
it, but try not to obsess too much. You will never be prepared for everything.
Prioritize. In survival it's called the rule of 3's. you can live 3 weeks without food, 3 days without water, and 3 minutes without air. So relax
and breathe! The air rule actually usually serves to remind you of shelter which is usually #1 priority, with water being very close behind. I would
concentrate there first. Shelter, and water. Katydyne makes some really nice portable filtration systems that can turn run off, or stream water into
potable water, and they fit in a backpack. When you have your shelter, and water solution look at food procurement/production. Learn to trap, and
hunt, and forage for food. Also think about time. Have a 24hr plan, a 72hr plan, a 3 month plan, and a forever plan. I have what are lovingly referred
to as B.O.B.s or Bug Out Bags in my vehicles, and at other strategic caches that have everything I would need to support me in most situations for
72hrs. They don't need to be big, expensive or fancy. Some people design them around a good survival knife attached to a sturdy pouch of some kind
like an old ammo pouch from a mil-surp store. For 72hrs you need to think mostly shelter, and water. So mine has a water filtration bottle that's
good for about 30 gallons, and makes about a gallon an hour, a good hunting knife, emergency blankets, simple first aid kit, a battery-less LED
flashlight, stiff mechanics wire, and nylon cord(for traps, fishing, or shelter building), some homemade firestarting stuff, and a small inexpensive
.22LR survival gun(for protection, and possible small game) I have a couple of these, and they aren't as expensive to put together as one might
think. Without the little .22 you can do it for under $50 not counting the bag. I realize in the UK the firearm probably isn't an option. This is for
just 72hrs, without any externally provided shelter, food, or support. Just me versus Situation X. Would it work in all situations? Nope, but in a
pinch it's better than a sinking feeling of sheer panic due to total unpreparedness. For instance: were I caught in a sudden winter storm on the side
of the road I could conserve body heat with the blankets, and burn my seat covers if I had to in order to stay warm. I could melt, filter, and drink
snow, or other precipitation, and were bambi, or thumper to inadvertantly cross my path I'd have dinner!
To prepare for a worse scenario, or for a longer period of time I would need more tools, and resources. If I can stay alive 72hrs I stand a better
chance of finding those tools, and resources if caught otherwise unprepared. So I'd start with the 72hr scenario, and build on that. Think
critically, and learn, learn, learn. OK, I've made it 3 days, now what will I need. OK, I made it 3 weeks, now what will I need. OK, I made it
and finally...Don't, Oh please don't go to a survivalist equipment sales site on the internet, and spend thousands on a pre-prepared solution that
someone else puts together. They might not think like you, or know your situation/environment. Only you know what will work best for you. Mechanic's
wire, and nylon cord is very cheap, and has so many uses it boggles the mind. and Duct tape!!!