Do I need multiple bank accounts for my DST or one bank account set up for the DST?

A DST can have its own bank account and credit card IF, AND ONLY IF, you are accounting for the money separately for each Series. If you think you are going to get sloppy with your accounting, then it is important to have separate bank accounts and separate credit cards. If the DST is operating under a DBA, then the DBA name can be used for the bank account. You would create the bank account using the name of the business in which you are opening a bank account for.