Starting your day without coffee is unthinkable, but it’s not always a simple as buying a cup on your way into the office. First of all, finding good coffee can be a challenge, even for city dwellers. And then there’s the problem of transporting it without spilling. And when it comes to great iced coffee, it becomes even harder to get a good cup and keep it cold on your commute.

Luckily, we have a brilliant solution for making excellent iced coffee and taking it on the go. The trick is to freeze concentrated coffee or espresso into ice cubes. This saves you from needing to add ice, which in turn means that you can carry your coffee in an airtight jar without ice diluting it during your commute. The coffee cubes melt as you travel, so you arrive at your desk with a perfectly chilled cup of iced coffee.

These few easy steps (and a little advance prep) will ensure that you spend every day happily caffeinated.

Step 1: The night before (or on the weekend, if you’re on top of your game), make a few shots of espresso or make a pot of very concentrated regular coffee.

Step 2: Let the coffee cool slightly, and then pour it into ice cube trays and freeze them.

Step 3: In the morning, pop a few coffee cubes out of the tray and put them into a Mason jar. Add cold milk of your choice and any sweetener you like. If you’ve frozen espresso shots, you can add extra milk to create an iced latte. Otherwise, select the amount of milk based on how strong you like your coffee.

Step 4: Screw on an airtight lid, and as you commute, your coffee will melt into a perfectly chilled beverage! Drink it early, and it’ll be less strong before the coffee cubes melt. Drink it later, and it’ll be stronger. You can also add more cold milk as the cubes melt to make your coffee last even longer.

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