For your own convienience I would suggest, that you prepare the containers yourself.
That will give you some advantages, just to name a few: you are not dependant on other users input, you can define different categories of password strength (low, medium, high), you can use different parametrizations for the containers.
Use public available password-lists from the internet to create containers with real world passwords, use a password generator to create containers with varying password length.
There is an initiative to perform a public security audit of the TrueCrypt software, just in case you did not hear about the Open Crypto Audit Project yet:
http://opencryptoaudit.org/
https://opencryptoaudit.org/reports/iSec_Final_Open_Crypto_Audit_Project_TrueCrypt_Security_Assessment.pdf
To be honest I can hardly imagine any connection between your research goal 'testing the trust of people' and your request for 'downloading a container, include a secret and pick a strong password'.
What do you want to evaluate?
If users put in a 'real secret' or just some random data?
How do you want to appraise if the data is a secret or not?
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