Eiruvin 3:1-2

Eiruvin 3:1

An eiruv to permit carrying in a courtyard and a shittuf to permit carrying in an alley may be made with any foodstuffs other than water and salt. Second-tithe money may be used to purchase any foodstuffs other than water and salt. If a person vows to abstain from sustenance, he may still have water and salt. An eiruv for a nazir may be made using wine (which he may not drink) and an eiruv for an Israelite Jew may be made using terumah (which he may not eat). Sumchos says that an eiruv for an Israelite may only be made using regular, non-sanctified food (that the Israelite may eat, i.e., not terumah). An eiruv for a kohein may be placed in the area of a grave that has been plowed (where he may not go). Rabbi Yehuda says that a kohein’s eiruv may even be placed in an actual cemetery because he could be carried there in an enclosed vehicle.

Eiruvin 3:2

One may make an eiruv for a courtyard or an eiruv techumin (to shift one’s personal Shabbos boundary) using demai (doubtfully-tithed produce), first tithe from which terumah has been taken, and second tithe and consecrated produce that have been redeemed; kohanim may use challah and terumah. An eiruv may not be made using tevel (untithed produce), nor first tithe from which terumah has not been taken, nor second tithe and consecrated produce that have not been redeemed. If a person sent his eiruv to be placed by a deaf-mute, a person of limited mental capabilities, or a minor (all of whom lack a presumption of mental competence), or via a person who does not accept the legal validity of an eiruv, the eiruv is invalid. If he sends another agent to receive it from this person and that second person places the eiruv in its ultimate place, the eiruv is valid.