Thanks all. I’ve copied these lists into a word document and will whittle them down to suit me.
Some things I thought of, not a complete bob. Some may have been mentioned.
sealed alcohol wipes
Vaseline
rubber gloves
leather work gloves
small folding shovel or well made garden trowel
compact accurate pellet gun & pellets
Quick dry, silver treated towels. They don’t get stinky, pack tightly, dry quickly and can provide sunblock.
These are on my to buy list.
https://www.shop.eclecticsilver.net/osc/catalog/product_info.php?products_id=114&osCsid=7b71ad59ba0c675f24c8575a8fa63aaf
And, if it's of the "CO2" variety rather than the "pump" variety, spare CO2 cartridges.