goutte

In this context, 'goutte' refers to a small drop of dew on a leaf after rain, which fits the meaning of a tiny spherical drop of liquid. 'Flaque' (puddle), 'rivière' (river), and 'mer' (sea) are much larger bodies of water.

'Goutte' (drop) is the most appropriate word to describe a small quantity of blood. 'Trace' (trace), 'tache' (stain), and 'marque' (mark) are less precise for a specific, tiny spherical amount of liquid.

'Gouttes' (drops) is the correct term for liquid medicine administered in small quantities, such as eye drops. 'Pilules' (pills) are solid, 'crèmes' (creams) are topical semi-solids, and 'sirops' (syrups) are liquid but typically taken orally in larger doses.

To subtly enhance the flavor, one would typically add a 'goutte' (drop) of lemon juice, not a 'tranche' (slice), 'cuillère' (spoonful), or 'portion' (portion), which imply larger quantities.

'Goutte' (drop) is used to quantify sweat. 'Larme' (tear) is for crying, 'rivière' (river) and 'flaque' (puddle) are far too large to describe a single bead of sweat.

When referring to a liquid like water in a glass, 'goutte' (drop) is the correct term to indicate that not even the smallest amount remained. 'Miette' (crumb) is for solid food, 'parcelle' (parcel/bit) and 'partie' (part) are more general and less specific to liquid remnants.