Shabbat 144: Volition, Liquids, Squeezing, Creating Ritual Impurity in Food

Some notes from today's daf:

• blood from the wound of an animal is ritually pure and does not render food susceptible to ritual impurity
• Akiva: more stringent re: milk than blood because if one mils an animal for medicine, the milk will make food open to ritual impurity
• if one lets blood for medical reasons, the blood is not a "liquid" status and is ritually pure (does not render food susceptible to ritual impurity)
• Akiva told the case of baskets of olives/grapes proves that volition counts
• a liquid that seeps from olives/grapes volitionally renders food open to ritual impurity
• liquid that seeps from them unvolitionally is ritually pure - no ritual impurity is feared
• thus liquid renders food susceptible to ritual impurity only if it emerged of its own volition
• does 'volitionally' refer to situations where one is happy about liquids?
• mulberries and pomegranates are not typically designated for squeezing
• volitionally refers to a situation where one's preference is not determined
• unvolitionally refers to a situation where one explicitly says and means that they are not pleased if liquid leaks
• liquid from olives and grapes stands to be lost and it is renounced from the outset
• Rabbi Yehuda gave in and agreed that olives and grapes' seepage on Shabbat is prohibited whether it is volitional or not volitional
• we may squeeze plums, quinces and crab apples but not pomegranates because that is typical use of pomegranates
• What about squeezing?
• If they are not designated for squeezing, fruit may be squeezed on Shabbat
• how do we determine what is typical? Do we base this on one important family's practice?
• If even one person ascribes significance to a liquid, it assumes the status of liquid for that person and thus it is forbidden on Shabbat
• any liquid added to a ritual bath that changes the appearance of that mikva creates ritual impurity 
• We may squeeze grapes into a cooking pot or squeeze milk from a goat into a pot of food on Shabbat because these are atypical actions
• Rav Chisda says that Shmuel says that we cannot squeeze these things into an empty bowl because liquid that comes into food is considered to be food as well rather than liquid
• If a zav milks a goat, is the milk ritually impure?
• The halacha is that food cannot become ritually impure unless it is rendered susceptible to ritual impurity through contact with a liquid
• perhaps it is the first drop, which is rubbed on the tip of the animal's teat, which is considered a liquid