Suppose one makes a "shehakol" on the water, and doesn't have in mind any other drinks. When there's a third of the glass left, the person refills the glass with seltzer/soda (the glass is now 1/3 water & 2/3 seltzer or soda). Would this addition of seltzer/ soda to the pre-existing drink would ...

There is a large non-Jewish cemetery near where I live. It has beautiful grounds and is open to the public for visiting. Is it OK to pray or study Torah there?