Water is the one part of the winter routine that cannot slip. A horse who drinks too little because his trough is frozen solid or his bucket water is icy is at real risk of dehydration and the impaction problems that follow, so keeping water open and drinkable on frosty days deserves a proper system rather than a daily wrestle with an ice-breaking hammer.
Why horses drink less in a freeze
Horses are reluctant to drink very cold water, and intake drops exactly when dry winter forage demands more water for digestion. Grass carries much of a horse's moisture in the grazing season; hay carries almost none, so winter drinking matters more, not less. A partially frozen trough that only offers a small drinking hole also puts lower-ranking horses off, because they cannot approach without crowding the herd's stronger members.
Keeping water open around the clock
A trough or bucket heater made for livestock use is the most reliable fix, fitted with its cable protected from teeth and run through a safety cut-out socket. Site the trough out of the wind and where it catches daytime sun, insulate the exposed sides and any pipework, and consider a dark-coloured trough that warms slightly in weak winter sun. A floating ball on the surface keeps a small area moving and ice-free in light frosts, and a cover over part of the trough slows freezing while leaving a clear drinking space. Piped automatic drinkers need their own attention: lag exposed pipe runs and check each bowl daily, because a drinker can be frozen solid while the main trough is fine.
The manual routine when you have no heater
Break ice morning and evening at minimum, and lift the broken pieces out rather than leaving sharp-edged shards floating in the water. Top up with a bucket of warm water to take the chill off and raise the level, because horses drink more readily when the water is not near freezing. Keep spare buckets somewhere frost-free, such as a tack room or house porch, so a frozen-solid bucket can simply be swapped instead of thawed. On the coldest nights, filling buckets fresh at the evening check rather than leaving them full overnight reduces the thickness of ice you face at dawn.
Check drinking, not just ice
An open trough is not proof your horse is drinking. Learn roughly how much the level normally falls each day, watch for dry, firm droppings and a horse who seems dull or off his forage, and check the water first whenever anything seems off. If a horse has clearly not drunk for many hours, seems uncomfortable or stops passing droppings, contact your vet the same day rather than waiting for the weather to improve. Adding the morning and evening water checks to your KinsLe Care Teams duties for the frosty weeks means the ice gets broken and the levels get read even on days when someone else does the yard.