Haha, that’s a very creative idea, but pine sap will give your coffee a resinous, almost pinecone flavor, and gravel will clog the filter and leave grit in the cup. For a clean, vintage‑style brew you’ll want a fine mesh or paper filter, a good quality bean—preferably something from Ethiopia or Colombia—and a proper 1:15 brew ratio. A classic French press or a hand‑drip set will keep the retro vibe without the extra forest floor punch.