The invention relates to a device for preparing a beverage by injection of water through a capsule containing a substance to be dissolved and/or to be extracted. The device comprises at least one water-injection system for introducing water inside the capsule. The injection system can be switched in order for a selection to be made between at least two different modes of wetting the substance so as to adapt wetting in accordance with the type of capsule and/or with the nature of the substance contained in the capsule. The invention aims to propose a device suitable for the preparation of a wider range of beverages, foaming or non-foaming, from substances to be extracted and/or soluble substances.