Let's say one lives with a Jew who doesn't bother to wash their hands (naagel wasser) in the morning and then this person touches a certain food. Can this food be eaten by someone else or does it possess "Ruach ra"?
According to Rabbi Kaganoff's article:
Yet another stringency is that one should be careful not to touch food without first washing away the ruach ra. However, if one did touch food prior to washing, the food may be eaten (Shu’t Shevus Yaakov 2:105; Artzos Hachayim, Eretz Yehudah 4:4; Darchei Teshuvah 116:35).
If I have a chance to get to any of these cited sources, I'll amend my answer.
Rabbi Avigdor Nebenzahl (notes to Mishnah Berurah 1:2) quotes the Vilna Gaon as saying that after the martyrdom of Graf Potocki (the famed “Ger Tzedek of Vilna”) in 1749, ruach ra'ah was no longer powerful enough to mandate washing immediately upon rising. From a more technical perspective, Shevut Yaakov (3:1) notes that this ruling is nowhere to be found in the Talmud. In fact, we have indications that immediate washing was not a concern: In discussing a proper morning routine, the Gemara (Berachot 15a) mentions that one is to relieve himself in the morning and only then wash his hands. For virtually all individuals, proper facilities were a long distance away (see, for example Shabbat 25b), making it likely that this Zohar was not followed. Perhaps most importantly, Birkei Yosef notes that our standard editions of the Zohar make no mention of this warning at all. Although some versions including the relevant passages have been found, our editions could give one reason to doubt this law's veracity. At the very least, this would explain Shulchan Aruch's omission. Also see http://ph.yhb.org.il/02-08-04/ There's no ruach rah