I’d definitely suggest cold brew or expresso. Both allow you to have strong concentrates which negates the water down effect of ice.
Cold brew is pretty simple to make, anywhere from a 1:4 to 1:6 coffee:water ratio will produce decent strong coffee overnight, and depending on the total amounts you can make a batch that will last a few days.
If you have the equipment expresso is much faster to make but can be more complicated to get just right. It will also be a bit more of a balance to mix the right amount of ice to chill it but not make it over watery.
I’m surprised to see quip here, honestly it’s never been for me (even with it’s salesforce integration). What do you like about it compared to gdocs / word?