Here are some essential information you can take note of when returning to the Kingdom.

On September 4, Bahrain resumed visas upon arrival for eligible nationalities. To determine eligibility, or to obtain an eVisa prior to your departure you can visit this link.

Arrival into Bahrain

All arriving passengers will be tested for COVID-19. 
All passengers must complete the Ministry of Health’s “Health Declaration Form” prior to departure to avoid delays upon arrival which will provided at check in counter
All passengers must download the official ” BeAware Bahrain” App prior to departure and pre-pay through the app to avoid delays upon arrival
How much are the COVID-19 tests?

The tests are subject to a BHD60, to be paid upon arrival regardless of the intended period of stay
The payment can be made through the official ” BeAware Bahrain” App, the Bahrain eGovernment Portal, or at a designated kiosk at the airport, where payment by cash or card is accepted
All passengers must undergo a PCR test (at their own expense) upon arrival and must remain in self  isolation until the result of the PCR test is determined; passengers that are 6 years and below are exempt from testing
Any passenger staying in Bahrain for more than ten (10) days must undergo a repeat PCR test on the 10th day following their arrival in the Kingdom

SOURCE: GULFINSIDER