You can create objects that store spells. Spells stored can be used as an Action or Bonus Action. The item must be non-magical before the time of casting. The object’s value must be 300 times the total spell levels stored. Almantic reagents for the spells are consumed at the time of creation of the object. The object is attuned to only the caster and may not be used by others. Once all the stored spells are cast the object turns to sand. The item must make contact with the skin in order to be utilized(jewelry are often the foci). Objects can be recharged as long as there exists at least one spell still stored and there is room/value for the incoming spell. The imbued object will be detectable as a magic item after spells are stored.
Example: Gelf stores his spells in a bejeweled amulet he inherited from his grandmother. The amulet is worth 1800gp. It’s value allows for up to 6 spell levels to be stored (1800/300). He stores a first level spell that he will never use so that the amulet won’t be destroyed. He has five more spell levels he can store. He stores a handy 3rd level and 2nd level spell before he departs for his adventure.