Take my collection of medieval weaponry, my bowie, my two-year supply of tasty crab chips, all the vitamin pills I can find, books, books, books, and me love with me and barricade ourself right here. Works fine, our door can be locked about as good as the one from the father and daughter in 28 Days Later.
The corroboration for reports of cannibalism is very weak, and the temptation to abuse such reports for racism and propaganda is very strong. On the subject, it is fair to say that we know considerably less than has been previously thought, and facts that can be substantiated are very scarce. Only a few reports withstand scrutiny, and because at least one of the peoples concerned has present political objections to being so characterized, we are going to drop the subject.
From what our profs reported during Asia Studies, specifically on topic of Polynesia, the whole cannibalism thing came up because a common practice among many tribes was to cut off their defeated enemies ears and chew on them until they were just a mess of cartilage, skin and blood, and then spit it on their lifeless bodies. To many explorers this might have seemed like corpse-eating, or it was only Chinese whispers from the Pacific to Europe.