I'm curious about this too but I haven't practiced it.
There are may types of scrying, using elements or mirrors. A water type of scrying is to take a bowl of water and dripping a color in it. The color should make images, symbols. Or you can look into the flames of a candle or something similar.
Or you can use a black mirror or moon mirror. Color a mirror black, after you purified it with salt and cleansed it, and put it in moonlight. Don't let sunlight touch it. You chould cover it during day time with a soft black material from a cloth. It is used at night. You should cleanse the scrying objects you use a lot of times, especially a mirror. Also, you should cast a protection spell or a circle.
I don't know if everything I wrote is correctly. Sorry.