(Mishnah): Ma'aser Sheni may be used for eating, drinking and rubbing. One must eat that which is normal to eat and rub that which is normal to rub.

One may not rub wine or vinegar but one may rub oil.

One may not add spices to oil of Ma'aser Sheni and one may not buy a mixture of oil and spices with Maaser money; but one may add spices to wine.

If one added honey and spices to Maaser wine (outside Yerushalayim) and it increased in value, it is redeemed according to the proportion of wine.

If fish was cooked with Ma'aser Sheni turnips and they increased in value, they are redeemed according to the proportion of turnips.

Dough of Ma'aser Sheni that was baked into bread (using Chulin firewood) and it increased in value, the improvement is ascribed only to the Ma'aser Sheni.

The general rule is - if the improvement (brought by a certain element) is recognizable, it is redeemed proportionally. If it is not recognizable, the value is ascribed to the other element.

(Gemara): Ma'aser Sheni may be used for eating etc. It may be used for eating and drinking because the pasuk uses the word eating (in Devarim 14:23) and eating includes drinking.

Question: What's the source that eating includes drinking?

Source #1 (R. Yona): The pasuk states (Vayikra 17:12), "Therefore I said to the children of Israel, no soul from amongst you should eat blood.''

What's the case? If it's congealed blood; there's a Baraisa that teaches that congealed blood isn't food or drink. Rather, it must be in liquid form and the Torah refers to it as eating.

Question (Baraisa): If a person liquidized fat and gulped it down or congealed blood and ate it, he is liable...?

How does R. Yona understand the Baraisa that says that congealed blood isn't food or drink? It doesn't have the Tumah of food or drinks.

(Source #2): R. Yona instead learned that drinking is included in eating from the following pasuk (Devarim 14:26), "And you shall give the money for whatever your soul desires...(wine...and you shall eat it...)''. (By the pasuk saying that you shall eat wine, it shows that drinking is included in eating.)

Rebuttal: What's the case? If a dish was cooked in wine, the wine would usually give negative flavor to the dish, which cannot be called eating.

Conclusion of Rebuttal (Rabbanan of Kisarin): The Torah is discussing a rice dish or a fig dish that is cooked in wine and eaten with it, making the wine secondary to the food (which is why the pasuk used the word 'eating' - but it does not prove that drinking is included in eating).