Going back to Army BCT as prior service. What, if any, religious items can I bring?

“The Army will approve requests for accommodation of religious practices, unless accommodation will adversely affect military necessity, including unit readiness, individual readiness, and health and/or safety for soldiers and units,” states All Army Activities message No. 002/2019.Dec 19, 2019"

"In accordance with Section 533(a)(1) of Public Law 112-239, as amended, the DoD
Components will accommodate individual expressions of sincerely held beliefs (conscience,
moral principles, or religious beliefs) which do not have an adverse impact on military readiness,
unit cohesion, good order and discipline, or health and safety. A Service member’s expression of
such beliefs may not, in so far as practicable, be used as the basis of any adverse personnel
action, discrimination, or denial of promotion, schooling, training, or assignment. "

https://www.esd.whs.mil/Portals/54/Documents/DD/issuances/dodi/130017p.pdf

They will allow you to practice your religion as much as possible. But there may be times you don't get to pray during training.

You're free to search more yourself to find further regulation or policy.

um, yeah.... it's basic training, I seriously doubt if you are going to have the time to break out your prayer mat several times a day.