Myth: Spiders drink moisture from the mouths or lips of sleeping humans. Fact: I have heard this legend verbally but it does not seem to be recorded in print anywhere. A variant that one person claimed to have heard on TV is that "a spider will drink from your eye (while you sleep) 3 times in your life."
Keeping this in consideration, do all spiders drink blood?
Myth: Spiders do not literally eat the insects they kill; they only suck the "juices" or blood. Fact: You can find this myth in many books; even some scientists, who have never bothered to look for themselves, believe it. As a first step in eating, the spider will literally vomit digestive fluid over the prey.
How long can a spider survive without food or water?
They can go very long periods without food or water. Specimens housed in a 12x17x6 cm plastic boxes have lived up to ten months without food or water and in 8 oz. airtight plastic containers six months without food, water, or air (Sandidge).
What does a spider need to live?
They attack only live insects, other spiders, and other invertebrates. A few very large spider species attack small vertebrates like lizards, minnows, or frogs, but this is rare. Spiders are famous for trapping their prey in webs of sticky silk, but many of them are wandering predators who don't use silk to catch prey.