How do you water your garden? Why can't you make the tea there? You can either use a battery aerator, they make them for fisherman or you can make non aerated tea. It works just fine.
For organic fertilizer, I use fish emulsion in my miracle grow sprayer. You can also used aged manures, blood meal, bone meal, or kelp meal. Sustain is a granular organic fertilizer 4-6-4 is a general purpose fertilizer that is omni rated.
it is mostly fish meal.
Some people use azomite, as it improves root development
I have also used Scott's organic lawn fertilizer NPK 11-2-2 . Based on my soil test I do not need phosphorus, potassium or calcium. Just nitrogen. This product has one of the highest nitrogen ratings next to blood meal.
Happy gardening in Hawaii. Gardens are where people grow.