(10:25 a.m. EST) -- Oceania Cruises' ships will be plastic water bottle-free zones starting in April as part of the line's Sail & Sustain environmental program.

"By introducing Vero Water to the Oceania Cruises experience, we are not only taking a quantum leap forward environmentally, we are providing our guests with the gold-standard of still and sparkling water," said Bob Binder, president and CEO of Oceania.

Instead of using plastic bottles, all Oceania ships will be outfitted with Vero Water's still and sparkling water distillations systems, which use Nano-Filtration and five separate layers of filters. The program is expected to eliminate an estimated three million plastic water bottles per year.

The Vero Water service will be implemented in two phases during the coming year. Phase one, which will begin with Riviera on April 2, focuses on implementing the onboard water service in suites, staterooms, restaurants, lounges and bars. All passenger accommodations will be outfitted with one-liter reusable glass bottles of still and or sparkling Vero Water, and cabin stewards will replenish as needed. This phase will be completed by mid-June with a roll-out as follows: Riviera, April 2; Marine, April 19; Regatta, May 1; Sirena, May 19; Nautica, May 30; and Insignia, June 19.

Phase two will enable cruisers to bring Vero Water ashore; all passengers will be provided with their own re-usable Vero Water bottle, which will be theirs to keep and take home with them. This phase-in is expected to start in the second half of 2019.

Oceania ships will continue to carry brand-name water, such as Perrier, as well as purified water for medical purposes.