Your "choa moljom anmashi gesoyo?" can be written '좋아, 뭘좀 안마시겠어요?" but it sounds a bit odd, so I should change this sentence according to your English version ; 마실 것 좀 드릴까요? ma sil got jom drill gga yo? 저랑 뭘 좀 같이 마실래요? jo rang mol jom ga chi ma sil re yo?
저랑 한잔 하실래요? (Would you like to drink with me?) jo rang han jan ha sil re yo?
저랑 맥주 한잔 하실래요? (Would you like to drink beer with me?) jo rang mek ju han jan ha sil re yo?