You can't, I'm afraid. Spell Mastery let's you prepare spells without looking at your book(i.e. without preperation). Dragon Disciples need to cast without a book.
And the DD isn't really intended for wizards. I don't think you'll be able to manage it short of some mythic shenanigans.
Your Arcane Bond lets you cast a spell without preparation.
Spell-like abilities that duplicate 1st level spells make you qualify, for example Aasimar with Heavenly Radiance feat or Half Elf with drow magic.
Maybe Preferred Spell on a level 1 feat like Magic Missile could work too
While I know, flavor-wise, it isn't intended for Wizards, it does boost Int rather than Cha. This is true in 3.5 as well...You can't, I'm afraid. Spell Mastery let's you prepare spells without looking at your book(i.e. without preperation). Dragon Disciples need to cast without a book.
And the DD isn't really intended for wizards. I don't think you'll be able to manage it short of some mythic shenanigans.
While a wizard can't normally qualify for dragon disciple without at least one level of bard, summoner, or sorcerer, they can choose to advance their wizard spellcasting once they qualify ("If a character had more than one arcane spellcasting class before becoming a dragon disciple, he must decide to which class he adds the new level for purposes of determining spells per day."); they don't have to advance the spontaneous casting class. Bard tends to fit better (Bardic Knowledge) with wizard than summoner or sorcerer (although sorcerer can give a slight boost to the bloodline abilities). In fact, a fighter 1/bard 1/wizard (transmuter, perhaps) 3/dragon disciple 4/eldritch knight X with Magical Knack (Wizard) can do fairly well as a self-buffing combatant.