I use ziplock freezer bags that you get in the supermarket. Depending on size of bag either 1/
2 or 1 litre a bag. Lay them down flat on a baking tray when freezing them. They thaw down alot quicker than bottles as greater surface area. When peak calving have buckets of fresh biestings in dairy. Use bovigen scour vaccine last couple years, rotavec before that..... most important thing that we do each winter, cuts out so much f#$king hassle with sick calves. 3 years ago we got bad dose of flu and didnt vaccinate the cows until february, but paid the price. We now do the earlier calvers before xmas and the rest in jan. Last year i bought electrolytes in jan to have in stock in case of hassle with lockdowns, they were never opened.