Guide to Electrical Equipment for Travelers/Adapter leads
These can be made up from appropriate plugs and extension sockets (or power strips if more than one socket is required) and cable. This method has the advantage of allowing use of the exact right parts (adapters often attempt to generalise which can lead to loose fitment and easy disloging). Another possibility is to make an adaptor lead with an IEC male plug (with pins as on the cables used to connect power from older PC PSUs to monitors) and an appropriate power strip. This can then be connected to a local power cord which should be easily obtainable in most countries. If not there is still the option of unscrewing the IEC male plug and screwing on a locally purchased plug.