Option 5--I have a KNIFE, a PISTOL WITH 8 ROUNDS OF AMMO, WATER PURIFICATION TABLETS, and a PLANT FIELD GUIDE. I choose to shoot up to 6 rounds of ammo at the cow.
I would prefer to not shoot the cows at all, but I need to eat by the end of Day 6, and I can't count on there being another opportunity for food next round.