Thanks for the reply... Recently I changed my coolant filter. I dumped what was in the old filter into the new filter. And just drove it afterwards for a couple of weeks.. I noticed it was down from my mark.. So I added about 15 oz of distilled water.. I didn't think I would've lost any coolant by doing it this way... Normal or not??? Last question I promise lol....
I don't know that its a good practice to empty fluids from the old filter into the new filter because it can transfer particulates along with the fluid.
Another method might just be to replace filter and top back up with a 50/50 Coolant Mix. You could add this mix to your new filter before installing if you wish.
IF you are losing coolant for any reason then you will see a continuous drop in the de-gas level week after week. Only when the level continues dropping 1" or more is it worth investigating. Even then it could be a leaky hose or waterpump, etc..
I have found my own MIN/MAX marks are not quite accurate. I could top off to the MAX mark every day for a month but as soon as I drive it to operating temp for a couple days the level drops to 1/4" below MIN and stays there for months.
As was suggested, buy some gauges. They will keep you occupied and are far more exciting than watching coolant level.