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.

"56"

I just turned 56 yesterday. There's one thing I can't stand about that, and that's having to plug my age in as 56 on the treadmill that I run on instead of 55. Each year I dislike that--having to increase my age by one year. I'm kind of funny that way. There was one advantage and that is that I was at the youngest I could possibly be in my age category in the recently run 5k. I was probably the oldest 55 year old, but at least I was at the bottom end of the range, which was 55-59. The only way I could have been personally one of real youngest is to have been born on July 3rd, and having just turned 55 the day before the race. As it was, I turned 55 361 days before the race. I wish my parents would have planned better for my birth...
Another thing I don't like about turning 56 is the life expectancy analysis at Blue Zones. Blue Zones is based off of a book in which unusually high populations of centenarians are examined by teams of scientists and medical professionals to find out why they live so long. They have a "How Long Will You Live?" calculator and among the other results it give is a category called "Your healthy life expectancy". Guess what my healthy life expectancy turns out to be according to their calculations? Yep. You guessed it. 56. Now, I know that's a crock, but I keep wondering why they came to that conclusion. They don't even know about my diverticulitis. They didn't even ask about my genetic history. I wonder what they base that on. Of course, my plan is to prove that wrong.
All that being said, I did something fun yesterday. I went fishing at Rockport. I didn't catch a thing, but in my book, you don't have to catch anything in order to have a good time.

The fishing was poor, but it was nice up there anyway.

 The water was really low, and where I was, there were remnants of old bottles, building foundations etc., that had once been underwater. I looked around for a few minutes, hoping to find an antique bottle still intact, but no such luck. I did find the bottom of a rectangular bottle that had to have been pretty old, and another object that was like some kind of a bottle cap marked with a  "T". I'll be posting some pics of those objects in my next blog entry to see if anyone knows what they are.