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.
Have the specific scrying tool you need.
If you wish to make one, get the ingredients and tools you need in order to make the scrying tool. You may read tutorials that give simple steps of making the tool you wish to make.
You can get a black cloth to take care of the energy your scrying tool absorbs.