The easiest way i know how to sharpen my scissors is to make cuts in a sheet of sandpaper. For my knives i slide the blade back and forth across a sheet.It works a treat!
I have a wet stone that I even take with me when I travel as I HATE dull knives. A little rub at an angle on each side of the stone and I am ready to go quickly. They are not expensive and can be purchased at sporting goods stores, hardware or knife speciality shops. They have a rather rough side and a smooth side for finishing.
In a pinch, you can sharpen a knife on the bottom of a ceramic coffee mug. Hold the blade at a slight angle and sharpen it on the unglazed ring on the bottom of the mug. It's not ideal, but it will work.
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