I use a Thermos insulated drink bottle every day because I prefer to drink water cold. It was high on my packing list because our trip was during Summer. It keeps the water cold for hours, even on very hot days.
We bought 2 additional insulated drinking bottles to use for coffee. Sometimes they were also used for iced green tea. They were Thermos brand, double walled, stainless steel and hold 470mls. With a jar of instant coffee and sachets of crema milk (always available and useful when there was no refrigerator) we had coffee with us every day.
