1. To be honest i promote commercial feeds because usually they are balance feeds. Meaning it have all the nutrients the animal needs. It you want to give other feeds/raw mat just give it in a sense na this is a meryenda and not the primary food of the animal/
2. Usually broilers are not dewormed. If you want to deworm them then you could use it.
3. Biolyte, i have read things about it in magazine so far according to them it is effective, it is like a multivitamins, immune booster etc... I do not know how much it. Pamalit? if you will look at them in terms of their use as per reference to articles written about them, it is okay to use as an alternative. This is not an endorsement and i am not demoting the other brand.
4. 1-2 weeks as long as full na ang kanilang feather and they are not piling on top of one another which is a sign that they are cold.
5. There are products for these but as you said 20 lang ang kanilang alaga. regular cleaning would do na. add charcoal to the manure to lessen the smell