I was intending to use it to begin a starter in my fridge that I would feed and bake from once a week or so. But this product seems designed to be used only to start a sponge that's used up within 7 days and not continually fed. Can I still use it the way I intended? I'm glutenfree, so getting an already-built starter isn't an option. I've created my own starter before, but I was hoping for a different flavor profile this time around. It was expensive, so I don't want to experiment without at least a few more opinions on the matter.