I'm not sure that this is 400 words but this is what I came up with.
Answer:
well, put all 4 of them in your mouth, next, take the drenched pills out of your mouth and examine 2 of them, put the rest in your pocket. blue dries faster, now we know how to differentiate them. To conclude it up, take the pills that are dry and wet. if both pills dry at a near time ratio, eat one from your hand, and another from your pocket.
Explanation: