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.
Yes, it is safe to drink the water from the public drinking fountains which can be found in many places in Barcelona. If you drink from the public drinking water fountain near the top of Las Ramblas street in Barcelona called La Font de Canaletes, then the legend is that you will always return to Barcelona.