Hunter, let me repeat, the fact that a bottle of alcohol was inventoried in the tent doesn’t prove there wasn’t another. Just as scraps of paper or a strip of chirkash could be in someone’s pocket, a small bottle could have been carried along and never made it into the official lists. Was this chirkash in the inventory, or the bits of paper you speak of? That’s not unusual in the field, inventories show what was found, not necessarily every personal item each hiker had on them.
Think of it this way: In Ukraine, it’s not uncommon for someone on a trek to have a hidden flask of samohon (home-distilled spirit) for warmth or morale, while the "official" supply stays with the group. If you later searched their camp and only found the communal bottle, would you assume no one ever carried their own? Of course not, common sense says a rogue flask could have existed, whether or not it was logged.
That said, I’m not even leaning on alcohol as the main answer here. Sap from conifers is highly flammable, and we know from both searcher reports and practical tests that resinous cedar and pine twigs will catch quickly. So while it’s worth keeping an open mind about "a missing bottle," they didn’t need alcohol to get that fire going at the cedar. Matches, paper scraps, birch bark, and resinous twigs are all you need.