When we lived out there, we rented a 2 bedroom townhouse for 3 people. Rent was $2100. Food was ~$500. Public transportation is good out there, so we used that exclusively for travel. And then another $100 for internet and bills. So ~$2700, but you could probably get that down to $2100 for just one person. This was in Mountain View.

That's about double what I pay to live in Florida.