بسم الله الرحمن الرحيم
(Fatwa: 729/696/SD=7/1438)
In the above mentioned case, it is lawful for you to use water and vegetable and you should do so out of precaution. It should be noted that if the party has practices that are against the Shariah then it is not lawful to participate in it.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
