These can be found in most camping supply stores or catalogs with everything from flip tops, pouring caps, shaker holes, to built in straws. Recently, a popular hanging kitchen utensil set has been marketed by several different companies. We used one on our Low's Lake trip and loved it. One spoon for mixing and eating is usually adequate. Instant coffee is easy to clean up, but for those of us who would rather not drink it at all if not fresh brewed, a french press is an idea.
Unbreakable ones come in all sizes.
The draw-back is you have to pack out the grounds. An insulated cup with a cover is great for keeping beverages warm. We used the BakePacker, in combination with their Open Country 2 qt. Pot, on our Low's Lake trip and found it to be an easy to use, labor saving innovation. A biodegradable soap, is the only soap you should use while kayaking, in fresh water.