In this passage, Oliver Cowdery initially wrote “the tradition of the Lamanites” in 𝓞. Virtually immediately, Oliver corrected the singular to the plural by inserting inline the s ending (there is no change in the level of ink flow). As discussed under Mosiah 1:5, either reading is possible. Here in Alma 47:36, the critical text will maintain the plural traditions, the virtually immediate correction in 𝓞.
Summary: Accept Oliver Cowdery’s corrected plural in the original manuscript for Alma 47:36: “drinking in with the traditions of the Lamanites”.