Yes. You can bring the water or juice to a boil, put it in a canning jar and add the needed pectin powder. Screw on the lid, pick up the jar with a hot pad and shake well to get the pectin saturated with liquid. Shake the jar every so often while the liquid is still hot. When the liquid cools down, put the jar in the refrigerator overnight. In the morning you should find fully dissolved liquid pectin (no pectin clumps whatsoever).
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Posted in: 5. Questions About Ingredients: Fruit, Acid, Alcohol, Sweeteners, and Making Jam with No Sweetener