Generally speaking, sugar is not very heavy, each dozens to hundreds of grams. Even if a piece of sugar is 500g at most, then 29 pieces are14.5kg.. As for KFC chicken nuggets, I've seen about 200 to 250g, with 4 nuggets at most 1 kg. So the two add up to at most 15.5 kg.
Now let's calculate how much hydrogen is needed to bear this weight. At 1 atmospheric pressure, the density of hydrogen is 0.0899 g/L at 0℃, and the air density at 0℃ and a standard atmospheric pressure (1.013×105pa) is1.293g/.
According to the size of the hydrogen balloon you said, it is estimated to be 5L. If the weight of the balloon itself is 5 grams, then a balloon can only bear 5× 1.2-5= 1 gram, which means a balloon can only bear 1 gram.
Divide 15.5 kg (15500 g) just calculated by 1 g to get the required amount of hydrogen. So the result is 15500 balloons.
As for whether you can reach Uranus or not, I can tell you responsibly that you will never reach Uranus. Why? Hydrogen balloons can only float by the buoyancy of the atmosphere. There is no atmosphere in outer space. Can your hydrogen balloon float? One more thing, I can tell you responsibly that your balloon can reach Jerusalem, but it doesn't have to stay there. This is based on probability. But there is no guarantee when it will arrive, maybe one year, maybe 10 year.
But I want to remind you that I don't know how to divide your 29 pieces of sugar and 4 pieces of chicken into 15500 pieces. If hydrogen balloons are tied together, I don't think there is a chance to reach Jerusalem. Maybe it drifted to the South Pole and was eaten by penguins. If we are separated, maybe your friend will have a chance to see a hydrogen balloon floating across Jerusalem. But you should tell your friends to look up at the sky every day from now on, or it would be a pity to miss the opportunity.
When answering your other questions, birds are not as boring as you think. They won't eat your food. But things are bound to get worse.
Also, if the hydrogen balloon can bounce things towards Uranus, then I can throw stones at the sun.
Through analysis, your method is both stupid and not novel, both stupid and naive. Why don't I give you a suggestion? Let your friend keep a flock of pigeons, then let him (her) give it to you, and then give her your things together with the pigeons. See how cool it is?