Answer:
What is the thing which, once poured out, cannot be gathered again?
Hard to catch, easy to hold. Can't be seen, unless it's cold.
Sometimes black, sometimes white, I have veins but no blood
My voice is tender, my waist is slender and I'm often invited to play. Yet wherever I go, I must take my bow or else I have nothing to say.
A warrior amongst the flowers, he bears a thrusting sword. He uses it whenever he must, to defend his golden hoard.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?