What are some reliable and cost effective services I can use, so that I can get cash from my home country bank?

If I have both bank accounts between my home country and my current visited country, I can simply use TransferWise so that I can get sufficient cash to spend in visited country.

If I do not have bank accounts in my current visited country, what are some reliable and cost effective services I can use, so that I can get cash from my home country bank?

The countries I plan to visit in near term as Sri Lanka, Vietnam, Thailand and Philippine.

Thank you.