Factors which increase water requirements include lactation, pregnancy, hot and dry weather, and sparse and dry feed. If these conditions apply, individual sheep may drink up to 6 litres of water or more daily. Sheep should not be deprived of water for more than 48 hours and in hot weather for no more than 24 hours. Water sources should be reliable and the water clean.
For cattle and deer, water is even more critical and essentially, they must have access to water at all times.
If the animals are lactating, or are in hot conditions or stressed (both induce heavy panting and water loss), their water requirements will be even higher.