Peregrina's got the right idea. Entertainer's Secret is also good stuff. It was developed for opera singers and replicates the mucus in your throat to keep your throat lubricated. Pleasant mild apple flavor. Only available online, I think.

I find Vocalzones to be too harsh unless I've a full-blown cold or sore throat. Only available in the UK (or online) but I get supplied through friends.

Avoid ice water while you're singing. I sing mostly in pubs, so I keep my voice lubricated with Guinness or Smuttynose's Robust Porter, but sipping warm water with some honey in it works a charm, too.

Linn