the typical vascular cylinder of a dicotyledonous plant or a gymnosperm, consisting of a ring of collateral bundles of xylem, cambium, and phloem. Origin of eustele.
Tap water is fine in Barbados, go in any restaurant and they will ask if you want water then give a choice of bottled or tap. They wouldn't be doing that if the water was bad. It is one of the few places around the world that I will drink tap water. I certainly don't drink it in the UK.
Tap water in Barcelona is drinkable and safe for drinking and cooking. Some people don't like the taste of Barcelona tap water very much, but the water is completely safe for drinking and cooking and won't upset your stomach. Restaurants serve bottled water, not tap water.