Your phrase "water, water everywhere, and not a drop to drink" is a famous line from Samuel Taylor Coleridge's poem The Rime of the Ancient Mariner. It vividly captures the irony of being surrounded by water that is undrinkable, often interpreted as a metaphor for situations where something is abundant but unusable. If you’d like, I can provide more information about:

• The poem and its themes
• The meaning and usage of this phrase
• Scientific reasons why seawater is undrinkable
• Ways to obtain drinkable water in emergencies

Just let me know what interests you!