I want to conserve my ,2 month wear, contact lends for 2 months or more. does any product exist to conserve?

the title says it, i have 2 month wear colored contact lends, and im planing on use it around 2 times every month during the whole year, i want to know the name of that product ( a liquid i suppose ) if it exists, that can conserve the contacts. To not end up with infected/expired contacts 3 months after i opened, that was used 9 days...