After looking at this question I wentweblio to look up the meaning of 酌む. The heading for the entry looks like this:
く・む【×汲む／酌む】
I'm wondering what the cross next to 汲む means. I've seen this in a few things I've looked up on Weblio and never managed to figure it out.
My guess is that it means 汲む is obsolete and I should use 酌む instead, but I'm not at all sure. Indeed, in the comment I just saw on the linked question from @Chocolate, I'm now certain my theory is wrong.
I assume Weblio has a page explaining its symbols but my Japanese isn't good enough to find it.