A coffee mug does not need much space until it spills. Papers, keyboards and charging ports tend to collect around the same convenient edge of a desk, which makes a drink placed there more consequential than it first appears. Give food and drinks a separate landing area before the work surface becomes crowded.
The best arrangement may be a nearby side table or another room for meals. If that is not possible, choose a stable area away from equipment and active documents. A coaster protects some finishes from moisture, but it does not contain a tipped cup or make an unstable surface safe.
Avoid balancing a drink on a stack of papers, a computer case or the narrow space behind a monitor. Keep it away from the reach used for a mouse, telephone or drawer handle. A lidded container can reduce some spills, but it still needs a sensible position and is not necessarily leakproof.
Keep the boundary useful
Move papers out before eating rather than laying a placemat over them. A project folder or tray gives active documents a temporary home without losing their order. Return them only after the surface has been cleared and cleaned according to its finish.
Keep a suitable waste container nearby so wrappers and used napkins do not remain among office supplies. Do not leave food in an equipment drawer or cabinet, where crumbs and spills are harder to notice. Wash hands before returning to the keyboard when food residue would otherwise transfer to it.
If a spill reaches powered equipment, stop using it and follow the manufacturer's safety guidance; do not keep typing to see whether it still works. Disconnect power only when it is safe to do so, and seek appropriate help for affected electrical equipment.
The habit does not need a sign or a strict-looking divider. A consistently clear place for the drink, a place for papers during meals and a short cleanup routine are enough to make the boundary recognizable. The goal is an ordinary desk that is easier to maintain, not a room where a cup of coffee becomes a planning exercise.
