If you could add five remedies to your home kit for flu season, these are what I would recommend.  It's getting more difficult to access homeopathic remedies and finding 200c potencies is even more challenging.  When you are sick, the last thing you want to do is go searching for what you need.  
 
Eupatorium perfoliatum 200c
Arsenicum album 200c
Gelsemium sempervirens 200c
China officinalis 200c
Mercurius solubilis 200c
 
And as an added bonus - Influenzinum 30c, a $35 value