Forget the ring saw.
Instead combine the saw and knife, get the SAK Rucksack model
locking blade "pocket knife".
You need a personal water container, a 1 liter platypus bag?
A K&M match case.
Some food and water tabs as mentioned.
"Do" rag.
3-4ft. of surgical tubing to suck water with or tourniquet etc.
Your own SS cup/pot in your helmet bag with a full
1 liter water bottle, cup on the bottom of the bottle.
Your own pyrotechnics if you are able, electronic flasher if not.
A couple photon style lights on zippers, one red for in A/C use,
one white for on the ground and signaling.
Bug goop of some kind and benedryl.
A couple large contractor trash bags, to many uses for these to leave them out.
A decent alternative is the Ritter pocket survival kit if you want a decent pre-made kit. You should still add the above items. Or just take the easy way out and get the Ritter Kit with a sm AMK first aid kit
At least look at the Ritter contents list.