The ice blocks we get today at marinas is usually poor quality low-density ice (full of air bubbles). We buy two at a time and keep them in plastic buckets that fit in our ice box, which is under a cockpit seat. (Small 12v Isotherm fridge is in cabin). We don't have a drain but I empty the buckets when we refresh ice, and about once a week I empty the whole icebox and clean it.