Are you meaning Calor? If so I think you will find that Calor is only available in the UK. How long are you going for? We only use gas for cooking and find a 6kgs bottle lasts about 50 nights.
I believe they have similar types of gas bottles and the same connections in Holland as we do here in Germany and these do differ from the UK. Besides, the gas sold here is neither pure butane nor propane, but a mixture of the two.