Go to the links page on the main website. Click on the USRSOG link. Have a read through their kit list.
I strongly suggest that you:
Make up an E.D.C. ring for yourself that has:
A ferro rod.
Compass.
Whistle.
Spark-lite & tinder.
Small torch.
Also:
Blag as much paracord for yourself as possible.
Get yourself a spare knife and multi-tool.
Some puritabs.
Go down to your local Hunting Shooting Fishing emporium and buy yourself at least two dozen of the cheapest small barbed hooks he has and some fishing line.
A couple of lighters. Wrap them in freezer bags.
Think about how to hide them. If you think that you are going to be "relieved" of you main kit, tape them - using surgical tape, not gaffer tape - to the small of your back. Just below your shoulder blades. Gives you the best chance of getting them through an initial search.
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I don't do dumb & helpless.