@Jakub113 , personally, I would not put out a tip jar. I supply a starter pack of coffee, water and snacks to my guest that covers 2 days. My listing nightly stays average 2-3 nights. I incorporate the cost of providing these items into my nightly rate. You can either increase your nightly stay to help offset the cost of coffee and/or limit the amount provided to your guest.
It helps if your coffee machine is a k-pod type coffee maker (provide 4 pods of single coffee servings) or if it is a standard coffee maker, supply a small jar of coffee to cover the first 2 days. Same can be done with your tea bags. You can update your listing description or your welcoming guest message to state a complimentary starter supply of coffee is provided..etc…