If you're looking for a dairy free marshmallow replacement, you could try using vegan marshmallows. You can also use dates as a marshmallow replacement by mashing the dates up and adding them directly to the mixture. This will definitely change the taste, but if you need a different option this may be it so you don't have to make a trip to the grocery store. But make sure to heat the mixture on low-medium heat to avoid crystalizing the sugar again.