Prep starts before the shopping trip
Before your zero-waste shopping experience, put aside glass jars and reusable containers for your visit. You can invest in silicone baggies for your produce (and then later transfer them to your storage jars) but the main goal is to save a dollar or two, then settle for what you already have. A useful tip would be to write the weight of the empty container on it so you don't waste time doing the math at the grocery store.