How Can A Sore Throat Be Treated?

hello! well, I began having a sore throat yesterday. It's fine, but the problem is that I have a small play on Friday where I need to use a deep voice. With the sore throat getting worst, I can't imitate that deep voice without clearing and coughing (which I CAN'T do in this play). So far, drinking lots of water, taking vitamins, and lots of sleep is my only home remedy. Now I also LOVE to drink tea... tea with a tablespoon of milk in it. Is dairy actually bad for a sore throat, so I've heard? Are there any other things I could do? I try to avoid using anything with citrus or lemon, as that makes me feel worst. Any advice?