A heavy crock, water bottle or cage cup can be used for water. Check water bottles frequently as they sometimes drip or clog up. Also use a heavy crock or cage cup for food. This is normal. You'll have to clean up the mess.
Ferrets prefer corners so place the litter box in a corner away from food and water.
Your ferret may choose it's own corner and it is easier to accommodate your ferret than try to change its habits. When your pet is allowed to run around the house, you will need several litter boxes and perhaps newspapers in the corners. Puppy potty pads, placed under litter boxes, can be used to help train your ferret to go in a particular corner. Occasionally you may have an accident. If you catch your ferret in the act, gently place it in the litter box, as many times as it takes.