Cucamelons: grape-sized watermelons that taste like cucumbers with a tinge of lime. wiki - Vernacular names include mouse melon, Mexican sour gherkin, cucamelon, Mexican miniature watermelon and Mexican sour cucumber
Collecting rainwater is relatively easy and is good for your home environment. Check this article: How to Harvest Rainwater. Detailed instructions for making a rain barrel and connecting several for a larger water storage capacity.