Rockport artifacts

On July 8th, I went fishing to Rockport Reservoir. The low water revealed in the area where I was fishing, some old foundations and some interesting artifacts. I picked up a couple of things, which I'm trying to identify. The first was this round object marked with the letter "T":

And then there was part of a broken bottle that looked like this:

If any of you antique experts out there have any ideas on what these are exactly, feel free to clue me in.