A lake and a spring are two very different things. In fact the spring does belong to a family in the village. Why is it important? Well, when you don't have access to running water every day (which I can say they don't through experiences visiting them) then you need a supplementary water source.
U.S., allies conduct 1 air strike in Syria and 11 in Iraq against ISIS militants (Reuters)
from the article: For Palestinian women, a picnic with a purpose