Realistically, the build proposed is super non-viable. If you're determined to make a viable mechanical build you should either focus on melee and stay around your summons, in which case I'd recommend Punish or Underhand, Age, LoF, Burn, Sinistro and whatever water you wanna take (As you said, Hydrant is trash. It's a waste of a spell slot). I don't really think Clock is worth it, I prefer Frostbite, but it's functional if you need the AoE. I think with better dial and summon play, you'll get more mileage out of Punishment.