Plastic bottle funnel

Step 3 Prep the bottle

Use the utility knife to cut off the bottom of the bottle. If you'll be using the funnel at an angle you can get fancy and cut the funnel at an angle that would keep the opening horizontal. I'd also suggest rinsing and drying the inside of the bottle.

Note - in some cases this is the only step you need. If the bottle opening will fit inside whatever you are pouring into then you don't need to mess with the cap or pen.