There's a spray called 'Clear Voice' that's very helpful. I'm always getting a hoarse voice or whatever, so I bought a batch of it a while ago. (Quite a while ago, and it seems to still be good and strong, in fact.)

I just found it sold online at Musician's Friend --
Clear Voice at Musician's Friend

But, it may be sold at a music store near you, or a health store. There are other sources online, too.

It's great stuff!