核心警示类

- "The last drop of water on the earth will be human tears."（地球上的最后一滴水将是人类的眼泪。）

- "Save water, waste is shameful."（节约用水，浪费可耻。）

- "Please don't waste the water!"（请不要浪费水资源!）

生命价值类

- "Water is the source of life, the lifeblood of agriculture and the blood of industry."（水是生命之源，农业的血液和工业的命脉。）

- "Water is precious! Imagine one day you are out of water!"（水很珍贵!想象有一天你无水可用的情景!）

行动号召类

- "Cherish water, love water, save water, start from me."（珍惜水、爱护水、节约水，从我做起。）

- "Please move your hands and turn off the faucet."（请关紧水龙头。）

环保理念类

- "Be water-wise, be green."（节约用水，绿色生活。）

- "Save water for the future generation."（为子孙后代节约用水。）

社会责任类

- "Water conservation is the responsibility of everyone."（节约用水是每个人的责任。）

- "Save water, benefit mankind, benefit in contemporary, the achievement is in the autumn."（节约用水造福人类，利在当代、功在千秋。）

说明：

以上宣传语涵盖警示、生命价值、行动号召、环保理念和社会责任等核心维度，兼顾权威性和传播效果。建议根据具体场景选择合适表述，例如公共场所可用"Please don't waste the water!"等直接呼吁类标语，家庭场景可搭配"Cherish water, start from me."等温馨提醒。