If we're in survival mode, should we make our own first aid material?

Well obviously the best way to go is to have good medical supplies in the first place. If you are talking about suddenly finding yourself in a survival situation when away from home with no kit, then this of course would depend on where you were.
If you have no equipment with you then we can safely assume we are not in the bush, that means we must be in civilisation somewhere. In which case I don't see any problem sourcing medical supplies.
IF we are talking post TEOTWAWKI & we have run out of medical supplies, that is a different kettle of fish. Different areas in different countries have different types of plants that can be used as a poultice. Cordage is easy to make from plant fibres to hold the poultice in place or close a wound. Fresh urine from a healthy person is the best for cleaning wounds. The bark of the willow tree is a source of Aspirin. Keeping wounds clean by licking until healed works well, & honey is well known to heal wounds. Bandages are reusable, so you should not be running out of these any time soon. Same with forceps, tweezers, needles & eye wash glass.
That is all I can think of right now.
Keith.


Don't forget that you can use your (Housewife) sewing kit for medical purposes. Needles for stitching & splinter removal, knives & awls for larger removals. Beeswax for tooth fillings & covering wounds.