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 safety in Portugal. In general, the water may be safe to drink in Portugal. Basically, the water is chlorinated and locals drink it from the tap with no problems. However, some strains of E. coli which you may not have immunity for, could be present in small concentrations causing diarrhea.