Is it obligatory to compensate the partner for spoilage of fodder due to adding water to it, knowing that the addition was unintentional and he did not know it would spoil it, and does compensation include only the cost of raw materials or does it also include profit, and is the injured party entitled to claim compensation for damage to the machine due to the partner's raw materials?

Firstly: If the addition of water to the feed during compaction leads to its spoilage, and this was not customary or requested, then compensation is due for what has been spoiled. However, if the owner of the feed instructed the addition of water, and was not prohibited from doing so, and the compacted feed did not spoil for him, then you are not liable for compensation unless the water exceeded the usual or requested amount. The spoilage might be due to another cause, such as his delay in taking the feed.

Secondly: In the case of compensation, you must guarantee an equivalent amount and quality of feed. The spoiled feed will be yours, and you must return the compaction fee. You are not obligated to pay for transportation, carrying, or selling the feed, nor for the expected profit from it. Rather, you are to deliver him sound, raw, uncompacted feed. It is permissible to agree upon giving him its value on the day of delivery.

Thirdly: You are not entitled to claim compensation for any damage the feed caused to the machine, because you did so voluntarily, and you could have refrained from compacting the feed mixed with impurities.