In almost all cases, you can put your own food in a hotel room refrigerator, but there are a few "High-Fidelity" caveats to keep in mind depending on the type of fridge provided. If your room has a standard empty mini-fridge, you are free to use it for leftovers, drinks, or medications. However, many upscale hotels use automated minibars equipped with weight or infrared sensors. If you move an existing item (like a $10 bottle of water) to make room for your salad, the system may automatically charge your room for that item. Some of these sensors are so sensitive that even jiggling a bottle triggers a charge. If you have an automated minibar, you should call the front desk and ask if they can provide a separate "unstocked" fridge for your personal use; many hotels will do this for a small daily fee or for free if you need it for medical reasons (like storing insulin). Also, remember that these small fridges often don't have a freezer compartment and may not stay as cold as a home refrigerator, so be cautious with highly perishable items like raw meat.