Spiders are known to obtain most of their hydration from their prey.

They extract bodily fluids from their prey using their fangs and digestive enzymes.

Some species of spiders also obtain water from their environment, such as from dew, raindrops, or other sources of humidity.

However, water intake from these external sources is considered secondary to their primary source of hydration, which is their food.

Therefore, it can be concluded that spiders do not solely rely on external sources of water for hydration, but primarily obtain it from their food.
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