thoughts for end of civilisation survival fishing --
fish like bait and it's easier to find as needed, worms in the hills, mussels on the shore; good all round bait for catching something big enough is small fish (eg minnows) and you can net, hook or trap these as needed.
chuck in a couple of simple lures though for sea and loch (on a hand line it'll be difficult to get these to work well in a river)
you're rig needs to be flexible to target the fish available so combine line size and hooks as needed. also good to have kit that's generally multi purpose. also good to remember that you'll lose line and hooks
so i'd have 3 lengths of diff sized line --
50 mtrs of braided 25lb strength line (the main casting line, braided line is thin and very strong (less bulk/weight, unlikely to lose it in a snag or big fish), but costly to buy)
25 mtrs of 10lb nylon monofil (this + below can be used as traces (ie hooked and tied to braid in 1m lengths) for bigger fish)
25 mtrs of 6lb nylon monofil (thin enough to catch smaller fish and take small hooks - eg trout, minnow)
1 spindle for the braid.
I'd be tempted to put in some wire traces for pike, to stop them biting through line, and wire and braid line can double for animal snares (v nasty though if not a survival situation)
small -> large + treble hooks (for 'snagging' fish)
take a look at otter boards -- http://www.bushcraftstuff.com/fishing/the-otter-board/ you could probly make one of these in the field, or chuck in a balloon (or condom), great for windy loch fishing when you can't cast far enough out and multipurpose. generally i'd look for flexibility so i'd take a multipurpose tackle kit rather than a pre-tied set line that's only suitable for one situation.