Reuse empty 2-liter plastic soda bottles by cutting off the top third of the bottle and keeping it in your trunk to use as a funnel when adding oil to your car’s engine.
Use a sharp knife to cut a slit into the plastic about a third of the way down from the bottle opening, where the shape of the bottle becomes vertical instead of slanted. Then, insert scissors into the slit and cut around the bottle. Invert the top of the bottle, and you’ll now have an oil funnel that fits perfectly into most cars. These homemade funnels will also work well in your kitchen.