To make zucchini less watery when cooking, you can sprinkle salt over the sliced or grated zucchini and let it sit for about 10-15 minutes. The salt will draw out some of the moisture. Afterward, use a clean cloth or paper towels to gently squeeze out the excess liquid before using the zucchini in your recipe. This technique helps reduce the water content and prevents your dish from becoming too watery.