I'm going away for four days in Oct. and there's nobody to take care of my two cats. If I leave enough food for them (they get water from a dripping tap) will they be o.k.? They are three years old, have lived in this apt. with me that whole time, and have never been alone for more than a day and a half. When that happened they left me a "present" on the bed. They'd freak out if I took them somewhere else so that's a worse option than leaving them alone. What do you think?