Hi,
I live in San Antonio and would be willing to work with you.. I have a 17ft. canoe and camping gear..
I am not an outfitter, however if I can help you and make a few dollars off of my gear...
Near San Antonio I would recommend the Gualalupe River, look at the maps (Topozone.com) for a place 12 miles up from the state park (I forget the name at the moment) There are not sandbars and most properties are posted so you will need to overnight at the park.
I am willing to drop you off and pick you up as needed.
Happy Trails
david_white@sbcglobal.net