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Let's hear it for cold-brewed iced coffee! You there, undercaffeinated zombie! Got a mason jar? Cold-brew has less quinic acid (a by-product of roasting) for your tummy's convenience and since acid is responsible for most of coffee's bitterness, you can ease up on the sweetener. Best of all, you can keep it tightly sealed in the fridge for weeks. Not that a jar of delicious cold-brew coffee will last weeks. Or even week. Follow hackmaster site Howdini's foolproof method and get your buzz on.

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