What would the options have been for a member of the Orthodox church have been for religious observations while travelling in Catholic countries during the middle-ages?

Presumably someone travelling with a large entourage could bring a priest along with them; but I'm more interested in people travelling alone or in small groups -- envoys, couriers, small merchants, etc.

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    Options for what? Where? When? – Samuel Russell Jul 11 '15 at 2:01
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    Same options as when traveling to Muslim countries, China, India, etc. – Alex Jul 11 '15 at 7:37