Stir together ground coffee and 7 cups cold water in a pitcher until all ground coffee is wet; let coffee mixture stand 12 hours at room temperature.
Pour coffee mixture through a large, fine wire-mesh strainer, discarding grounds. Clean strainer; place a coffee filter or double layer of cheesecloth in strainer, and pour coffee mixture through lined strainer. Add vanilla; cover and chill up to 1 month.
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