In the nature of Earth Day, I'm not just going to open a bag of fertilizer. For lack of a shovel, I'm using a 2L pop bottle as a scoop for soil. The last time my compost was filled was in March. That might be good, but I'll find other soils as well.
The bottle has a line on the bottom. Use that a as a marker. Cut along that line. Keep the lid on the bottle as you'll need it to hold dirt.