每人每天至少应摄入1200ml的水。
但由于环境、气候、运动量、以及个人体质的差异，需水量也会不同。若是夏季或初秋炎热天气，长时间待在户外，出汗较多，最好每天饮水2000-3000ml。而冬季出汗少每天1200-1500ml即可。
所以每日8杯水，应选择每杯200ml较好。
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扩展资料：
水喝多了，也很严重：
1、水中毒
人体若是大量饮水，容易导致体内钠离子流失，严重的会引起水中毒。正常饮水的朋友不必担心，但若常做重体力劳动、体育训练的朋友，一定要注意适当喝些淡盐水。
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2、湿气重
水喝多了，会影响脾胃，有些朋友体型偏胖，舌苔厚，体内湿气严重，若是喝了过量的水，反而加重体内湿气，影响脾胃功能，时间长了还会危及心脏，影响血压。
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3、心肾受损
过量喝水，会促使人体分泌“抗利尿激素”，增加尿液的排泄次数，容易使体内钠、钾、氯等电解质流失。若是适当饮水，可以帮助肾脏排毒；但若是过量，则会加重肾脏负担，甚至心肾皆损，严重危害健康。
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健康饮水：
1、少喝冰水、不喝过烫的水
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2、早起喝杯温开水、每天少量多次喝水
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3、还有最重要的一点：喝的水一定要干净！干净是保证饮水健康的第一步。
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参考资料来源：/mr.baidu.com/petzbkn?f=cp"target="_blank"title="百度百科-饮水">百度百科-饮水