You can spread the goji berries out on a tray and spray them with water. Allow them to sit just a couple of minutes to soften and then soak them for five to 10 minutes or until they are nice and plump. For teas, you can soak them for five minutes in boiling water.
Making Goji Juice
To make goji juice, soak your berries overnight. Then toss the berries and soaking liquid into a blender and add enough water to get them to blend easily. Purée and strain through a coffee filter or loose-weave cloth in a glass or pitcher. In about two hours all of the liquid should have dripped out. You can add more water to the pulp and allow it to drain again to get more juice out of your berries.
Goji berries are used in a number of recipes. Follow the directions in your recipe to rehydrate them. How long you should soak them depends on whether you want them chewy or soft and easily mashed. You can also eat them straight out of the bag with no soaking. Choose the texture that suits you best.