A shaman who selects Lore for their spirit will be able to add a number of Sorc/Wiz spells of their choice to their spell list equal to their Charisma modifier.
One thing to note, in case you missed it, the number of spells you get with the spirit guide Oracle would be based on your wisdom.
And there is also the Pathfinder Savant prestige class. That is the universal solution to getting spells of up to 8th level for any class added to whatever spell list you are using as a full caster.
The Ancient Lorekeeper oracle archetype also can get wizard spells as oracle spells.
If you worship Baphomet, you can prepare all the Monstrous Physique spells, as well as Maze as an extra bonus.
He's CE, though. Though, seems comparatively reasonable, for a CE deity...
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For all characters, UMD is one of the easiest ways to go. The charisma score is your friend, helps stat out UMD. Dangerously Curious as a trait from the magic traits. It gives you UMD as a class skill plus one more plus one bonus as a trait bonus to boost the skill.
Cheap magic items that help stat out UMD are: a cracked magenta ioun stone, +2 competence bonus to any one skill, 800 gp from the pfs primer.
It gets more expensive but worth it, a wand key ring from the acg. Three thousand gold for a plus ten insight bonus toward one spell.
More expensive but if charisma is one of the main stats for the skills you have chosen, a circlet of persuasion. Plus three competence bonus toward all your characters charisma skills, 4,500 gp.
being a Half Elf and putting skill focus toward UMD.
Most likely you'll be using scrolls. A wand is ideal though, a dc of 20 for all your checks no matter the wand, no AoO either.
All my fighters have a -2 charisma but UMD cracked out for the wand of shield in the first round of combat.