Last week I made Nathan a big container of iced coffee and it usually lasts the whole week. It's super easy and all you have to do is add water and cream in the mornings. Here is the simple recipe. I usually make it times 3 or 4.
1 cup grounds
4 cups water
Stir and let it sit 8-12 hours. Strain twice and pour into an airtight container. Just add water and cream to your preference.