Here is a chart I worked on showing what I consider to be the cheapest way to make rocket fuel, the entire crafting side coming from coal is optional but supportive and recommended. Essentially just requires sugar cane, salt, and coal. You can substitute sugar cane for something else, but with snad why would you? Charcoal works in the place of coal just fine. Side note: you should make multiple setups for ammonia as it is the bottle neck for this Any comments on improvement suggestions are appreciated.