Context: 'That would leave me with no water. I would like 1 package of water, 2 packages of food, and 2 packages of firewood.' 'You'll have some water, this is for extra.  Would you take 2 packages of food and 3 packages of firewood in exchange for me getting 3 packages of water and 1 package of food?' 'Yes, I would.'
Utterance: 'And you can use your extra firewood to purify any water you find as well while you're already enjoying the fire.'