Coolant leak on 2004 - 986 S

[Emerald]

Since we all “like” a mystery — was getting coolant puddle in front of right rear tire and ended up replacing the water pump. All seemed well for a few days but then progressively started smelling hot coolant more and more. Also the level went down to about an inch of the bottom of the reservoir when off overnight. I thought maybe an air bubble at first as it purged but then did it again. Lost close to about .5 gal of coolant with not a dip on the floor. Checked under carpet in trunk and there’s a little like .3 cup of fluid on bottom. Thought maybe overfilled or dreaded cracked res. Noticed about 2 drops near top on side of res. Checked oil cap and No white. Ok hears where I’m rightly ready to be ridiculed. I was in a hurry while testing the coolant leak and bought a resevior cap for 8 bucks at Oreilly’s. I had home made a pump to pressurize the res before so maybe should give it another go? Not sure why but engine seems rougher running than norm. All help and barbs welcomed. Thx. Craig