Rinse the cranberries thoroughly with cold water. No need to thaw frozen ones.
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Add cranberries and water to a large pot. Bring to a gentle boil over medium-high heat.
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Simmer uncovered for 15–20 minutes, stirring occasionally, until cranberries pop and soften.
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Remove from heat and allow to cool for 10 minutes.
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Strain the mixture using a fine mesh strainer or cheesecloth. Press the pulp to extract as much juice as possible.
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Add optional flavor boosters like lemon, cinnamon, or mint into the bottle while warm.
Transfer to a clean glass bottle or jar. Store in the fridge.
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Shake before serving. Keeps fresh for 5 to 7 days.