The molasses, or any sugar, is not exactly a fertilizer, but a food for the bacteria that the plant uses to uptake its nutrients. That means that you can use it by itself with success if you don't have anything else.
Composting is a great way to turn your food trash into fertilizer; it just takes time.
Epsom salt comes to mind as something that would be laying around the house that would be useful to plants. It supplies magnesium and sulphur. Also, wood ashes are almost a complete fertilizer, lacking only sulphur. Not everyone has a woodburning stove or fireplace, but outdoor fire pits are popular these days, or you could just use the ashes from a charcoal grill.
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