I am well aware of the history but the situation today is quite different from the past. Back then, Singapore's dependence on Malaysia for water was a critical vulnerability and LKY's assertive stance was aimed at safeguarding the country's survival.
However, times have changed. Singapore has invested heavily in water self-sufficiency, with technologies like desalination and NEWater, reducing the reliance on external sources. Additionally, the global political environment, the development of international law, and diplomatic relations make military action over such disputes highly unlikely today.
While the historical threats were real and understandable in that context, the idea of launching an attack now over water supply is highly unlikely scenario. is it not? 
 
 
Diplomacy, international pressure, and legal mechanisms would come into play before anything escalated to that level.