It does depend on what kind of knife you have, as different grinds do require a different sharpening technique. But for the most part, you’ll need a whetstone to sharpen your survival knife. There are many small, portable whetstones, ceramic sharpeners and diamond sharpeners on the market.
Find one which is small and light enough for you to carry with you during camping, hunting, backpacking and tactical expeditions.
You need to be familiar with the grind of your knife as this will determine how you hold the knife when sharpening. There are lots of YouTube videos out there to demonstrate exactly how to sharpen each specific knife blade.