If you have an Altar in your house of La Santa Muerte first if you have flowers the should be roses, claveles, nardos, gardenias, tulipanes any kind of flowers you like. So she can feel contuble on making or dreams and what we want true. But never let the flowers dry becuase she will only bring to your house negative things to your life. The flowers most comment are white roses and red.
Candy if you put a bar of chocolate that will help to make the people aroud you to be more sweet with each other. Also it may help you with love. Another ingridiant is honey it also helps if you want love and you are asking for her help. Its not requer to put chocolate you can put any kind of candy thats a personal choice.
Fruits if you put fruits you should put apples but specially red and yellow the red apples are related for love and the yellow for money. Don't let fruit sit there for a long time because the power that your altar will start lossing power.
If you are going to give water the water should be clear and clean and its better if you just grave it from the sick. The cup should be glass never pt the water in plastic cups. Make shure that the water is always clean on her Altar and that it never gets kind of dar because that means that family problems are going to occur and as soon as this happens just replace new water to the cup and that will iliminate the problems. If some bubbles appear in the cup that means that your job, project and the ideas you have are going to come out perfectly with no problems. If nothing comes out in the water and is just like you left it that means that your projecs in your future are going to come true.