What would happen if someone (a priest, parishioner, deacon or anyone) spills the wine during a Eucharist service at a Catholic church?
An accidental spill of the Precious Blood can be cleaned up by soaking it up by placing a "purificator" which is a linen specially reserved to come into contact with the consecrated wine (one can use multiple of this linens depending the quantity of liquid) and then soaking them back in water do dissolve or dilute the Precious Blood. Then it can be poured into the ground where no people or animals would regularly step on. Like a flower bed or similar appropriate area. In Catholic churches there is a sink (called sacrarium) in the sacristy that the drain does not connect to the regular sewage line but rather directly to the ground and is specially design to wash the sacred vessels that would contain minimal traces of the Precious Blood or Body of our Lord.