Rinse the blueberries and lime thoroughly under cool running water. Pat them gently dry, especially if you want the finished pitcher to look bright and polished.

Add the blueberries and lime slices or wedges to a large pitcher. Pour in the cold water, leaving enough room to add ice later if desired.

Gently press a few blueberries with the back of a spoon to release extra flavor. Avoid crushing all the berries, since leaving most of them whole keeps the water clearer and the fruit attractive.

Refrigerate the pitcher for at least 30 minutes. For a more pronounced blueberry-lime flavor, let it infuse for 1–2 hours.

Serve the infused water over ice and add 4–6 fresh mint leaves if desired. For the best flavor and freshness, keep the pitcher refrigerated and use it within about 24 hours.