TrailerMonkey

Right after surgery, your body is in a major heal mode. Many people find it difficult to get in the required Protein and Fluid at the beginning. Just keep working towards those goals and you should be able to get there. Having said this, you are at week 3 and should have made some progress at this point.
Protein
Many experience problems drinking Protein Shakes. I hated them. But in the beginning I drank them, three 16-ounce protein shakes a day, in order to meet my protein requirements. You do not have to like protein shakes only tolerate them. There are many varieties of protein shakes available today. Experiment until you can find one you can tolerate. I used Muscle Milk Light (Vanilla Creme) powder blended with Water and a half a banana. That worked for me. But on the opposite end of the spectrum, you might try premixed Isopure.
If you tried all the various varieties and still are unsuccessfully, then there is the fallback of fortified milk. 32 ounces of 1% milk fortified by adding 1 cup of dried milk provides 56 grams of protein. It also takes a dent out of meeting the fluid requirements. Mix up a pitcher and drink a little throughout the day.
Without sufficient protein, your body will scavenge protein from other areas of your body, such as your muscles. Protein is extremely important after surgery as its job in the body is to build and maintain tissues including your body's major organs and skeletal muscles. Protein deficiency, when continued over a long period of time can cause a disease known as protein caloric malnutrition. Common symptoms are poor healing, fatigue, Hair loss and muscle wasting. Immediate post op, protein promotes healing of the staple line and incisions.
Fluids
It is common for your taste buds to change after surgery. Be willing to experiment. After surgery, my taste buds changed dramatically. Even water changed. In the hospital it tasted excessively chlorinated and I could not drink it. So I experimented. sugar free popsicles became my best friend. Some individuals find hot or cold can help with fluids. For me, I found that I could tolerate flavored water. So I began using Crystal Light. I also found a new drink Bai which I liked cold. In the winter, I found that I tolerate Hot Drinks such as piping hot cocoa. But you have to use the "No Sugar Added" variety. Also fine English teas were very good.
The fluid requirement is met by a combination. It is not only the water that you drink each day. But also the water you drink when you take your Vitamins and medicine. It is the milk you drink. It is the fluids content of the protein shakes. It is the water component of the Soups you take. It is met by flavored water such as Crystal Light. It is met by sugar free popsicles. It is met by tea and Decaf coffee. It is a combination of all the fluids that you consume during the day.