I am looking for an organic fertilizer to use in
tomatoes/cucumbers/herbs - in containers. I planted them with potting
soil. Any help is appreciated.

Fish emulsion is not balanced and will affect fruit production. No
phosphorus, just nitrogen. I learned this the hard way.
Try mixing in with the soil when you make it up to put in the pot:
1/2 c blood meal
bone meal
sulfate of potash
soft rock phosphate
soil sulfur
Roz
az usa