Im on amoxyslin, metrindazole and flucanazol for 4 days for vaginal infection feeling strange taste when drinking water is it normal ?!

Metronidazole: This is from the metronidazole, which sometimes causes a peculiar taste in the mouth, often called "metallic" (similar to what a piece of iron might taste like). It's not harmful and will go away when you have finished treatment. (FYI, this is an atypical combination of antibiotics for a vaginal infection. I wonder if the amoxicillin is necessary. Maybe check with your doctor.)