Most spiders do drink or require a regular daily amount of water. In the wild, most spiders will drink from any available source such as droplets on vegetation or the ground or from early morning dew that has gathered upon their webs. If a spider is kept in captivity it is good to provide them with a fresh water source such as in a small bottle cap or a damp sponge for smaller species, and a small dish for larger species.
It is a myth that spiders live in drains. When you find a spider in a building or in the shower, it is usually because it’s a good source of water for them and then they typically remain trapped because the sides are too slippery or steep for them to climb back out.
Depending on the species, different spiders may use different methods to quench their thirst. The whistling spider which resides in the desert, covers its burrow with a thin layer of silk to keep it humid and dew or raindrops are captured using a silk covered mound near the entrance. Some species of spiders ingest nectar, while others quench their thirst by drinking dew drops in early morning.
A common practice for many species of spiders to follow as a way to get their regular intake of water is to consume their spider web first thing every morning. By doing this they consume water that has condensed as droplets onto the web. Other spiders may use their pincers to take water from their webs and place it into their mouths.
While, spiders such as the black widow and the red back do not drink water at all. Instead they get all of the fluid that they require by sucking the juices from their prey.