Measure 8 cups of water and combine with the entire pound of coffee grounds in a large container; stir once and cover. Let steep for 24 hours. After steeping, filter through a coffee filter into a pitcher and refrigerate for 8 hours. For the simple syrup, combine equal parts water and sugar in a saucepan over medium heat, stirring until dissolved and clear, then allow to cool and store airtight in the refrigerator. To serve, fill a glass with ice, add ½ cup concentrate and ½ cup water, sweeten with simple syrup to taste, and finish with half and half as desired. Stir well and enjoy.