Most Bulgarian villagers insulate their water-meters during the winter months. The usual way is to use polythene, (known as nylon in Bulgaria). You wind a wide strip around the water-meter, perhaps five or six times or more, and tie the ends tightly with string so as to get a fairly air tight seal around the pipe. Any old polythene will do, perhaps from fertiliser bags or similar. A more modern and efficient method would be to use bubble wrap, and even better still, if you can get it, metallised reflecting bubble-foil.
All Bulgarian villagers know how to insulate a water-meter (vodomer). Maybe you could contact a local who could do it in their own way.
If the worst happens and the water-meter ices up and bursts then you will have to contact the local waterman when you return to the house in the spring. You will then have to buy a new water-meter and the waterman will visit and fit it and add a company seal. The fitting of the water-meter should be free, however no attempt will be made to read the broken meter, instead, after a short interval, you will receive a large bill for water used, based on a monthly rate and backdated to some arbitrary time in the past. This will not be cheap. It is far preferable to have a vodomer than to pay the monthly rate, but if the vodomer malfunctions this is the company's fall back option.
Fingers crossed, and with the assistance of a helpful neighbour, it will not happen, but if the water meter goes through the winter, undrained and uninsulated, it probably will. Here ends my tail.