You can instruct your bank to carry out recurring transfers/standing instructions for a period time. You can set up a recurring local funds transfer via digibank online. Below are some references on how to do it:

• DBS Standing Instructions (via PC ibanking only, not on mobile app)
  PC ibanking > transfer > more transfer services > other services > view standing instructions > from account > setup standing instructions > https://www.dbs.com.sg/personal/support/bank-local-funds-view-recurring-funds-transfer.html

• OCBC Recurring Transfer
  Mobile banking app – Home > main menu > transfer and payment > scheduled transfer PC Internet banking – Transfer and payment > Recurring transfer https://www.ocbc.com/personal-banking/online-banking/funds-transfer.html

• Trust Bank (by Fairprice Group)
  Do not support Standing Instructions or eGIRO for the time being as indicated on the last question of the FAQ. https://trustbank.sg/faqs/pay-and-transfer/#can-i-transfer-money-on-a-regular-basis-to-other-bank-accountsbeing

• UOB Scheduled Transfer
  Mobile banking > pay and transfer > from account to account > date of transfer > frequency of recurring fund transfer https://www.uob.com.sg/personal/customer-service/tmrw-user-guide/payment-and-transfers.page

• HSBC Recurring Transfers
  See page 8 (step 7) of pdf PC Internet banking – Pay & Transfer>Recurring transfer>Transfer in Singapore>From account>Setup new payee account>select ‘recurring transfer’