i need help with this riddle, it's very hard. try if you dare.

for some reason i think it's an endoplasmic reticulum

but i'm not sure why

okay, so i figured out the answer finally, lol.
the answer is tea
tea is black or gray typically.
tea isn't white. but there is a such thing as white tea, but it's still not white anyway.
another name for steep is soak, so you soak the tea in the water.
and the party, well obviously, a tea party.