POEM OF THE DAY

I call on you when I am sad
No one can really know you inside the rain
A bride will always invite you on her wedding day
You celebrate happiness with some people
You are most common when a man dies
You attend their funeral
Strictly by invitation
I adore your saltiness
but it can't cook a food
I like your water
but it can't even quench a thirst
You are indeed strange my dear friend of the eye

what's the answer to this poem?