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I’m going on a trip and I don’t have a proper Netilat Yadayim cup. Can I use a disposable cup?
The halacha requires that one use a keli (vessel) for Netilat Yadayim. The Poskim differ as to whether a disposable cup (such as a paper cup, or plastic bottle) is acceptable. Igrot Moshe (OC 4:39) ruled that one should not use a disposable cup for kiddush because kiddush requires that the cup have hashivut, or stature. Some draw the conclusion from this teshuva that a disposable cup is called a keli; although it is not acceptable for kiddush it would be acceptable for Netilat Yadayim, which does not require Hashivut. Minhat Yitzhak (10:23) rules that one should avoid using a disposable cup.
Rav Schachter shlita ruled that since even a disposable cup is often used multiple times in the course of a meal, it clearly qualifies as a keli. Many of the lenient Poskim, however, agree that if one can avoid the question by thinking ahead and packing a proper (that is, durable) cup, one should do so. (see Piske Teshuvot 159:7).