Plants with fleshy, leathery, waxy or succulent leaves tend to like it dry and can go weeks without water, even in the summer. Plain water, city or country, is suitable for most plants. There are a few plant varieties that are sensitive to fluoride in the water. These are monocots such as lilies and grasses. Plant foliage that you would describe as blades instead of leaves are often in this category and should be watered with spring, distilled, rain or well water if your city adds fluoride to the tap water.
Plants prefer a good soaking when they are watered, as opposed to frequent, light watering.
In containers with good drainage and a saucer, you simply add water until it is coming out the drain hole or filled to the rim. Wait 10-15 minutes for excess water to drain, then empty the saucer. It seems like the water runs through my plant so quickly and is dry a day or two later. Look to see if the plant has gotten so dry that it has pulled away from the sides of the pot, allowing the water to pass straight through. Add new soil to fill the gap and water again.