plain dour but here is a recipe my mother-in-law has been making for Mint Dour in a 2 litre bottle.
makes almost 2 liters
500gm plain yogurt (it needs to be a bit sour)
1 tsp dried mint
1 tsp salt
1 1/4 litres water
Mix yogurt with mint and salt. Add water and fill bottle. Shake the bottle. It will make just under 2 litres. Enjoy right away or after its had a stay in the frig.