Can I prepare the cucumber lime mineral water ahead of time, and if so, how long will it stay fresh in the refrigerator?
Yes—assemble the cucumber, lime slices, juice, and any mint in still water up to 12–24 hours in advance, keeping the covered pitcher refrigerated. For the best fizz and flavor, top it off with chilled sparkling mineral water (or fresh ice) just before serving; once mixed with the bubbles, aim to enjoy it within 4–6 hours.
What are the best ingredient substitutions if I don’t have sparkling mineral water or fresh limes available?
Swap the sparkling mineral water for chilled club soda, plain seltzer, or even still filtered water with a pinch of salt to restore some mineral content. If fresh limes are unavailable, use 1–2 tablespoons of bottled 100 % lime juice or substitute with fresh lemon slices/juice for a similarly bright citrus note.
How can I scale this recipe for a large gathering without diluting its flavor and fizz?
Multiply all solid ingredients by the number of guests, infusing the cucumber-lime base (plus optional mint and salt) in a small amount of still water up to a day ahead, then keep it chilled. Just before serving, pour the well-chilled sparkling mineral water over the concentrated infusion and add frozen cucumber “ice” slices; this preserves full flavor while the last-minute carbonation safeguards maximum fizz. Serve from covered pitchers or a drink dispenser with the spout positioned above the solids so bubbles stay lively throughout the event.