Cold brew coffee. It's delicious, it's quick, it's easy (almost dangerously so). I've put the recipe on here before years ago (the photos are terrible, sorry) but it's worth a repost.
We've been having some super hot days here and there so this and popsicles are the only way I'm staying sane in our apartment without A/C. I guzzled down two glasses before 11am (it made for a productive morning)
Here's how to make it:
In a jar, stir together 2/3 cup coarse coffee grounds and 3 cups water
Cover and put it in the refrigerator overnight or at least 12 hours
In the morning, strain twice through a fine-mesh sieve lined with cheesecloth (Alternately you could press through a french press)
Drink as is or add milk, half&half, sugar or whatever else you normally add to coffee!