Personally speaking, I help when I can, but since this isn't my real job I cannot afford to answer every question.
-Sorry for the trouble. I appreciate very much for your help and understand that all members are volunteer.
Three separate landlords with no written leases? This is sketchy if this is the situation for three separate places in a specific 6 month period. If I were you, I would assume that CIC will view this suspiciously and do all you can to provide the best documentation you can for this period.
Assuming you are in Ontario, a landlord does not have to provide a written lease but:
"Where there is no written tenancy agreement, a landlord must inform the tenant, in writing, of the landlord's legal name and address within 21 days after the tenancy begins. If the landlord does not give the tenant a copy of the signed lease within 21 days or, if there is no written agreement and the landlord fails to inform the tenant of its legal name and address within 21 days, the tenant does not have to pay rent. However, once the landlord provides the tenant with the required document(s), the tenant must pay back any rent that they withheld. If the tenant refuses, the landlord could seek to evict the tenant for arrears of rent."
http://www.ltb.gov.on.ca/en/Key_Information/STEL02_111463.html
At minimum you need to provide the landlord's name and address. Also at minimum, you need to get your friends (the tenants) to provide a
notarized letter stating that you lived there between XX date and XX date and paid $XX each week/month/whatever. If you can't get it notarized, a letter is better than nothing, but given that your documentation for this time period is not the best (travel, lack of steady employment and lack of stable living arrangement), you really should to get it notarized. CIC will take the letters (and you) much more seriously that way.
Good luck.
p.s. I don't recommend wasting time trying to get documentation from the landlords, (beyond their legal name and address which the official tenants should already have), but regardless, the CIC is not going to report the landlords to the CRA. In Canadian government, this is considered an invasion of privacy and agreements about information sharing between different agencies typically require special legislation or explicit permission from those providing the information.
-My friends know the landlord by first name basis. One would not even talk to them, after the first request he has been avoiding the calls.
- I do have credit card statements, Car insurance on that address.