-아/어서 links a first action to 나누다 'divide, share', and six of these eight lines end in 나눠 먹다 'split it and eat it': 2개만 시켜서 나눠 먹고 'let's just order two and share', 수박 한 통 사서 나눠 먹어야죠 'you should buy a whole watermelon and share it'. 나눠주다 is portioning it out to other people. One line divides over time rather than between people: 한 끼를 세 번에 걸쳐서 나눠 먹는데 'I split one meal across three sittings'.