Fish Emulsion is a liquid, you will need to mix a small amount with water before watering...And you can also throw in some used coffee grinds, mabey even a super small amount of Molasses and for Nitrogen you can add even a few grass clippings from your lawn
If you want to get more into this grab a plastic cup like a party cup and cut a few holes in the bottom, grab some rocks and fill it up a small amount, put some sand if you can get some and put that cup around where you water, and run some water over it and it will slowly seep into your plants giving it a small amount of constant nutrients...only do this once or twice a week such as a Tuesday and Friday or just get on a small scheduel don't overdo it thoough small amounts