After you cut the cucumbers and want to keep them fresh you should put the cut up cucumbers into a small container and then fill the container with water to cover the cucumbers.
And then put them in the refrigerator and the cucumbers will stay fresh for up to a week.
Another way to keep cucumbers fresh is to soak a paper towel in water and then wrap the sliced cucumbers in the paper towels and then place them in the refrigerator and they'll also keep fresh for up to a week.