Managing Organization Cash Flows (RE: credit/debit)

Sorry if this question is incredibly basic. I am on the board of a student organization. Our credit union has a policy against providing debit cards to student organizations. In the past, the officers have paid for "whatever" and are then reimbursed by the organization.

I understand the CU not wanting to take on the risk, but we are uncomfortable with the amount of risk our board members have to take on. Furthermore, many locations are unwilling to accept the "personal checks" the CU provided. Does anyone have experience with this or any ideas of an alternative process?

Thanks for y'all's help!