I like to make my Daiquiris from a 50/50 blend of Bacardi Carta Blanca (37.5% alc./vol) and Bacardi Limited Edition Heritage (44.5% alc./vol.) which yields...
Yes, the bottle is sealed with a crown cap but we send it with a cork stopper to use to reseal once open. It will last indefinitely with this stopper in place if stored standing. (All spirits and liqueurs should be stored so liquid is not in contact with stopper.)