My waterflow tank is always empty, help

Not real clear on how it happened but my radiator blew. So I ended up replacing my radiator, waterflow tank and sensors. Things were going well and after 3 months the waterflow tank was empty. I filled it and again in 3 months time it was bone dry. The car has no other problems except the constant need to refill the waterflow tank. Now I am facing the need to fill it every day. Obviously what ever the problem is it got worse, but the car still performs great in spite of the disappearing water act. There is no sign of leaks anywhere. I have no idea where the water is going. Any ideas out there?:eek7: This is driving me crazy. I want to fix the problem but don't know what it is. I need this car to last me another 2 years. Some one please shine some light on this for me.:confused:

Tighten your hose connections. The coolant is only a liquid when its under pressure. As soon as it leaks through a hose connection it turns to vapor. Also double check your water pump to make sure its not leaking from there