Every summer, millions of us hand over $7 for iced coffee that tastes like someone described coffee to a glass of milk. Meanwhile the home version costs sixty cents and takes less skill than toast. The barista is lovely; the math is not.

Cold Brew: the Patient Method

Coarse grounds plus cold water, 1:8 ratio, 12–18 hours in the fridge, strain. Smooth, low-acid, keeps a week — the make-once-drink-all-week economy. A jar and a sieve are the entire equipment list.

The Ice Betrayal

Regular ice dilutes your coffee into sadness within minutes. Fixes: coffee ice cubes (freeze leftover brew — the pro move), or brew double-strength hot over ice (the Japanese-style flash chill that keeps brightness).

The Milk Mathematics

Cold foam at home: shake cold milk in a jar 30 seconds, or froth with a $12 wand. Oat milk foams like a dream. The $7 drink was 80% presentation — presentation you now own.

The Sixty-Cent Receipt

Beans in bulk plus tap water plus your own fridge: roughly $0.60 per glass versus $7. That gap, five days a week, is $1,600 a year — or one very nice vacation funded entirely by not queueing.

Jar of cold brew Sunday, coffee ice cubes always, milk shaken not bought. Summer’s best iced coffee lives in your fridge now — the drive-through can keep the queue.