Drop

A little drop am I,

Don't underestimate me.

I can fill up the ocean slowly,

I can cause a ripple in silent shores,

I can alter the potency of a drug,

I can raise suspicion with an iota of doubt.

I can change the taste of food,

I can change the state of mood,

Don't underestimate me,

Even though I seem negligible,

I am powerful.