ありとある

• あり (ari) is the 連用形(れんようけい) (ren'yōkei) of ある (aru)
• と (to) is a particle, which, when combined with two of the same verb, expresses the idea of "all" or "every"
• ある (aru) is in its 連体形(れんたいけい) (rentaikei, “attributive form”), which is required for this type of と (to) construction

ありとある • (ari to aru) 

1. synonym of ありとあらゆる (ari to arayuru, “all, every”)