If your cat has contracted the feline flu, you can do a few things to help them feel better. First and foremost, keep them hydrated by giving them plenty of clean water. If their temperature is high, try to cool them down with cool mist or ice packs. If they seem lazy or have a poor appetite, give them fluids and soft food to eat. Finally, make sure they are kept up-to-date on their vaccinations by taking them in for their next shots as soon as possible.