To dream that you spill something represents your carelessness and inconsideration of someone’s feelings. You are not paying enough attention to those around you and as a result are offending and upsetting them. Alternatively, the dream may be a metaphor for something that you are dying to say, as in “spill it.”
To dream that you spill some food indicates that you need to eliminate that food from your diet.
To dream that you spill a drink at a party symbolises your social ineptness and awkwardness in a social situation.