Home Distiller

Im not a fan of adding sugar to my recipes. I never put it in my grain bills. I tried my first attempt at making peach brandy and added no sugar to it. I broke the tube to my hydrometer and havent bought a new one yet do i dont know the starting gravity. After it fermented and distilled there wasnt much alcohol in it. I could tell by taste and smell. So my question is, when making fruit brandies is it necessary to add sugar or do you get enough from the fruit itself?