There is no real substance in the dictum to drink 8 glasses of water a day, other than water has no calories and no additives.
Be guided by thirst, and also the colour of your urine. If it is clear, cut back on fluid a little; if it is dark, drink more.
We get a lot of fluid in the foods that we eat - especially fruits and veges. Even cheese has fluid!
Milk, tea, juice, jelly, coffee, etc. etc. all count as fluid - just don't overdo caffeine or sugars.
Where it comes to you are working, it would be helpful if you had access to water if you need it - taking a water bottle will help prevent possible dehydration.
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