It depends on the complexity of your cooking kit. If you are portaging a complete camp via pack animal, watercraft or landrover then a set of premade tripod or H frame irons, s hooks, chains, gonch hook etc is no problem. If your on walkabout like some aussie swagman your kit is going to come from the bush. Remember that any activity, especially fire will impact the natural environment. The Apache cowboys of Arizona don't bother with tripods, but instead dig a slanting ditch with a a pair of construction rebar or pipe as a rack. The fire is built in the deepest part and shoveled onto the dutch ovens, coffeepot etc. For a simple one pot system grumit has described a classic fulcrum and lever that can be easily crafted from hardwood. Just remember your plant I.D. skills. more than one scout in the USA has succumbed to roasting marshmellows on toxic sticks. The nice bit of using bits of local wood is reducing your impact. Those heavy tripods don't increase your carry, which literally increases your footprint on the soil structure. You haven't bought a product that requires extractive and transport costs to a distant environment. Now some young bushcrafter in another part of the world has a bit of woodland saved from a ironworks or roadway. Congratulations, You are now a bushcrafter AND a deep ecologist.