You can't make gummy candy out of an alginate mold. Alginate has a water base and would just mix into the gummy candy. You could use alginate to make a casting of your toe in another material like a low melt wax or plaster. Then you'd use that plaster or wax toe to make the silicone mold.
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Instructables has a number of explanations of body casting and gummy candies.Short version: use silicone for more a more durable mold; use alginate for a cheaper one.