Have you see a tablets that could prevent going hoarse?

I'm preparing to go to an encampment, where on earth I know from experience that I'll be losing my voice from shouting. What I'm wondering is if there happen to be a cough syrup type thing that would abet prevent or delay this.Have you see a tablets that could prevent going hoarse?
1.) Take lots of Vitamin C -- not a multivitamin.
2.) If you are of endorsed age, whiskey/rum toddies can help -- thaw up a shot of alcohol mixed with lemon liquid and honey and drink it. Mix it syrupy -- the honey coats your throat, the alcohol sterilizes it and the lemon juice give you still more Vitamin C
3.) When you must shout, do it from the belly, not the chest or throat.
Have fun!
Lower the volume and try having some rime cream.
There's nothing that will prevent someone from going hoarse--only mortal quiet will accomplish that.
BUT, as a singer here are some things that can help hang on to your vocal chords loose and lubed, for this reason keeping the damage down some.
Warm liquids--keeping the chords heat will keep them from tightening up so much.
Honey, throat lozenges---anything that will coat the chords keep them from experiencing so much friction.---which kinda goes mitt in mitt with heat up liquids.
Hydration--obvious reason.

There could be some more ideas, but those enjoy always worked for me surrounded by the past.