Hmm... and head is "capo" in Latin (skull: "caput"), which almost sounds like "cup". Now I've just checked the etymology of "cup", and turned out I wasn't completely wrong, just a little bit. :)
It is not from Latin "capo" but from late Latin "cupa", which was borrowed throughout Germanic: Old Frisian kopp "cup, head," Middle Low German kopp "cup," Middle Dutch coppe, Dutch kopje "cup, head." German cognate Kopf now means exclusively "head".
So after all it can be derived from head or skull in English, too. ;)
It's exactly that sort of observation which led to the "discovery" of the Indo-European or Eurasian source for many modern languages. I saw a documentary about an 18th or 19th century British linguist who was studying Sanskrit and Hindi in India, and he kept finding words which were common to European and Indian languages - such as Ma/Mom/Mother and Pa/Papa/Father. When he got to 200 or so words, he realized there had to be a common source. It changed his life as he altered his course of study to try to discover the contours of this ancient common-source language.
But...i think the intended question was, what do you say in a reataurant? If you say "I want a tea" at an anerican restaurant, you will be given a dirty look as it is considered quite rude. Compare this to Brazil, where you say "Eu quero um chá (por favor) / I want a tea (please)" to order. Do you say я хочу at a restaurant or other shop?
We say "declined" (sorry, no polite sounding way of saying that...).
Feminine and Masculine words ending in -a/-я decline in the accusative always.
The "inanimate rule" only really applies to masculine and neuter words in the Accusative - all other times they will decline.