Published at Monday, August 27th 2018, 07:35:30 AM by Melanie Gay. Knives. The selection of survival knives is a personal choice. Evaluate what type of terrain you will be in (Desert, Jungle, Woods, Rocks), what your most likely needs will be (digging for water, building a fire, making a shelter, cutting bandages, gathering food), your own physical strength (Don't buy a 5lb. Knife if you can't use it) and keep in mind the points discussed above. When you make your selection remember - Cheap is not a bargain when you need to survive. You do not get any ribbons for finishing second in a survival situation!