翻译：Our cat does not drink water.
In Chinese, 我们的猫 = Our cat or Our cats. Both are correct. It depends on the context of the sentence. Basically, Chinese is more focused on the Topic, which is its meaning, while English is more focused on the Subject, which is "who" and the state or form of an action (Tense). "Omitting" a 量词 happens a lot in Chinese, such as 我们的孩子（们），我们的车（辆们），我们的宠物（们），in another word, 我们的孩子 is telling you about Child (not cow), 我们的车 is about Car (not plane), 我们的宠物 is about Pet (not food). So it doesn't really matter to use singular or plural in Chinese. But, we ALWAYS use 数词 Numerals + 量词 Classifiers to specify the details of the "Topic", such as 我有三只猫；昨天他丢了三头牛；我每天要喝五杯咖啡；我的邻居养了七只鸟、三条蛇和一头大象。