There are a few different DTS technologies, some of which are lossy and some not.
The ones that are not lossy are "HD Master" or "DTS:X HD Master". FYI the lossless ones also have a lossy "core" so that they are backwards compatible with older playback gear, or gear with fewer channels.
If you have a DTS AVCHD, DVD Video, or BluRay (unencrypted) you can extract the audio from it using AudioMuxer:
http://www.surroundbyus.com/sbu/viewtopic.php?f=7&t=135
If you have a "DTS Music Disc" (a CD) probably the easiest way to extract audio is with foobar2000 and a dts plugin. Maybe AudioMuxer does that too, however, so check the manual.
In any case nothing is going to get you lossless audio from a lossy source.
Mixdown to stereo can be done with sox, maybe also with tools like ffmpeg and eac3to (again, check the AudioMuxer manual before getting more tools).
I am not understanding "dts in a dts container". Some dts wav files have been named .dts, instead of .wav and if your playback mechanism works with dts .wav files you probably just need to rename the .dts files to .wav.
There is on fine point for files that have been made specifically for streaming via spdif. I forget the details but once again, covered in the AudioMuxer manual.
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