Its sure been a while since I have been on here (hopefully some remember me)

I have a quick question for you.
My white budgie snowy who has been sick now with who knows what for about a year (she was like this when I got her from that breeder/seller)
I have tried everything to get her better (s76, amox, worm away, bayrtil etc) over the time I have had her, and she still hasnt gotten better.
Its been about 6 or so months since I have given her anything (I know I have been a little neglegent, with work and life) She still has the tail bobbing, and throws up her food, or coughs/sneezes or makes a weird duck sound every so often. Otherwise shes always active and singing, which is crazy lol.
Today I got home from work, and thought about her. I HAVENT tried Ronivet, so I decided to order some, which I did today.
I want to try the mixture of giving amox and ronivet as someone told me to try this, which I will be doing.
What is the dosage for this? And for how long? And can it be stored in the fridge or does it have to be mixed fresh daily?
Thanks!