No need to hire the neighbor’s kids for watering-can duty while you’re on Nantucket this summer. Keep houseplants moist and happy while you’re away with DriWater ($1.50 each, Stokes Seeds, www.stokeseeds.com). Slit open the gel packs (you’ll need two for an eight-inch pot) and place them upside down on the soil. The solution will slowly dissolve into the dirt for up to 30 days. After that, sorry to say, you’ll just have to come home.