purus adj 'pure' (more simply than other examples given) becomes puro (rare) ritually purify. So

butyro melleque vivo puro

can be (Gilgamesh) "I purify with life-giving butter and honey;" or (Winnie ille Pooh) "I live off pure butter and honey."

purus adj 'pure' (more simply than other examples given) becomes puro (rare) ritually purify.
And vivus, lifegiving, becomes vivo, I live, So therefore:

butyro melleque vivo puro

can be (Gilgamesh) "I purify with life-giving butter and honey;" or (Winnie ille Pooh) "I live off pure butter and honey."