Re: How can I get a spider to drink a liquid?

Spiders do drink!  In fact, if they have been without water for a long 
period they will approach a water droplet and drink from it, very much like 
they would drink dew droplets in nature.  However, if they are not slightly 
dehydrated, it may be difficult to get them to drink.   Some spiders also 
ingest nectar from extrafloral nectraries.  

Spiders need the proper space and support for their webs.   Those that spin 
large flat orb webs need a correspondingly large space and 
surrounding support, such as branches.

References:

Taylor, R. M., and W. A. Foster. 1996. Spider nectarivory. American 
Entomol. 42:82-86.