Why does my cat insist on drinking out of my glass or the toilet?

If I have a glass of water, my cat fights me beacuse she wants it. If I leave the toilet lid down, she sits there until I open it so she can get a drink. I fill her water bowl everyday with fresh water but she WILL NOT drink from it. Why does she do this and how can I get her to stop? Its driving me crazy. I almost have to get cups with lids so she will leave mine alone! lol I love her but shes a nut!