I have been filling my water up to the top once a day. I would like to know where the water is going. I dont have any leaks. I cant smell it. Just every time I open my cap theres no water in there. Im using a koyo radiator but im not sure what type of cap I have, I know it isnt stock. My cap screws on pretty easy, would this be my problem? Do I need a higher pressure cap? if this helps any, im using prestone with 50/50 mixture.

 

You need to get your paws on a cooling system pressure tester. They screw onto the radiator and pumpup. They have a gauge so you can watch for leakdown and have an adapter to test the cap.
You can overpressurize the system a bit to force the leak to appear usally if it is external.
That would be the first thing I would try. Some of the auto parts stores like "Autozone" here in Texas will let you use tools. I am not sure if a pressure tester is one of them but I would not be surprised seeing how often that would be requested.
Good luck.

 

if you dont have a catch can then the water is exiting the radiator through the cap due to expansion of the water when it heats up (hence the pressure in the cooling system).