Critical Care...How often?

Just got the call from the vet...Good news is teeth look perfectly aligned but there's inflammation in the mouth. Could be tumor could be infection, not sure but she's putting him on antibiotics and Critical Care. Never used CC before so I need yall's advice on how to mix and how often to give. Jasper will only eat pellets no hay, nothing hard. Thanks in advance. Prayers Please...this is a Humane Society rescue and I am wanting to give the lil fella a second chance.