Oh but they do. Flesh means flesh but not always the carnal mortal flesh. Blood does mean blood and the Jews (Jesus and the apostles) were strictly forbidden to eat it. Water does mean water in that the amniotic fluid is water.
Now, if you want water to always mean water would you tell us that you have "rivers of water flowing from your belly"?
If bread always meant bread why aren't you eating bread instead of claiming to eat flesh?
John 6:51 I am the living bread that came down from heaven. Whoever eats this bread will live forever. This bread is my flesh, which I will give for the life of the world."
Is the word of God literally both milk and meat?
Should we continue with this literalism?
It's not just a few passages here and there. What I see is a lack of real criteria to say what's meant when there can be conflicting interpretations. For instance:
2 Thess 2:11
"God shall send them a strong delusion, so that they should believe a lie."
BUT
1 Cor. 14:33
"God is not the author of confusion."
Acts 2:18
"And on my handmaids on that day I shall pour out my spirit, and they shall prophesy."
BUT
1 Tim 2:1-2
"I suffer not a woman to teach, but to be in silence."
Prov. 13:22
"A good man leaveth an inheritance to his children's children."
BUT
Matthew 6:34
"Therefore, take no thought for the morrow."
Num 6:5
"In all his days dedicated to God, no razor shall come upon his head. He shall be holy, and let the locks of hair grow freely."
BUT
1 Cor 11:14
"Doth not even nature itself teach you, that if a man have long hair, it is a shame unto him?"
Gen 2:3
"And God blessed the Sabbath day, and made it holy."
BUT
Isaiah 1:13
"The new moons and sabbaths, the calling of assemblies, I cannot abide: it is unrighteous."
BUT
Exodus 21:8
"Remember the Sabbath day, to keep it holy."
BUT
Romans 14:5
"One man esteemeth one day above another; another man esteemeth every day alike. Let every man be fully persuaded in his own mind."
My point is that none of these things are obvious in their meanings, unless you have the advantage of a long-lived, coherent interpretative community of believers.
Which you reject from the git-go.
So if I have the choice between trusting either a many-centuries-long interpretive community, OR Cynical Bear -- well, don't be surprised if I decline to privilege your POV over that of a hundred generations of believers.