The answer to this question depends on the specific spider species and its environment. Generally speaking, though, spiders can go weeks without eating and months without needing to drink water. The reason for this is that most spiders are used to surviving in arid climates and can adjust their metabolism to conserve food and water when necessary.
The amount of time that a spider can go without eating also varies depending on its size and age. Baby spiders (also known as spider lings) can typically go a month without consuming food and a week without drinking any liquid. Adult spiders, on the other hand, can live for much longer periods without food, especially if they are large and mature.
To help them survive in unfavorable environments, some spider species can enter diapause. This is a state of inactivity or dormancy that slows down the metabolic processes and allows the spider to go even longer without consuming any food.
Spiders can also store both food and water inside them, which they can use when their reserves are depleted. This means that they can go a few months without consuming any food or drink, even if they don’t have anything in their body to sustain them.
However, it is important to keep in mind that although spiders can survive for a while without food, they need to consume it on a regular basis if it’s available. In some cases, such as if the spider is trapped under a glass, you may want to consider feeding it in order to keep it alive until it can escape. Just make sure that you don’t feed the spider something too big, as this can be fatal.