Jay,
From my experience ...
Most OTP datasets will be limited to routine program data (i.e. admissions and exits by type over time). In some settings this might be expanded to include admission criteria. Data collected by SQUEAC coverage assessments will usually include MUAC / WHZ at admission in addition to routine programming data. Some NGOs collect wider datasets but these are usually limited to anthropometry at admission and throughout the treatment episode.
This means that we are limited to research datasets. I think the richest datasets will be from the VALID's CTC research program. They collected full clinical data for all cases. I guess that ACF may have similar data from their alternative to CTC (similar to CTC/CMAM but with a short inpatient stay for all children). VALID Nutrition have tested quite a number of RUTF formulations over the past decade or so and may also have useful data.
Maybe you know all this.
I have data from a study in Malawi which records week number, date, weight, height, MUAC, oedema, TSF (2 measurements), diarrhoea, fever, vomiting, cough, RUTF ration, and outcome for each visit.
I also have data from Nigeria which was a records pull, which records routine admission medications give, admission weight, admission height, admission MUAC, admission oedema, diarrhoea at admission, fever at admission, vomiting at admission, cough at admission, diarrhoea after, fever after admission, vomiting after admission, cough after admission, and some other data. This has the usual issues with pulled records but the sample size is > 100,000. The sample size brings false discovery issues.
I think it should be possible to share these datasets with you. Let me know if they are of any interest.