Réponse :
Dans ces phrases, on exprime un conseil.
(je ne sais pas pour la deuxième phrase)
Chips: You should be careful, eating too many chips will result in an unhealthy lifestyle.
Water: You really should try and drink more water to stay hydrated properly!
Soda: You should avoid drinking soda, it's full of sugar and if you're really thirsty, drink water instead!
Explications :