May God bless you for being ambitious and generous in your sacrifices this Lent.
You mentioned that you are Anglican, not Catholic. For us Catholics, Ash Wednesday and Good Friday are days of fast and abstinence from meat, all Fridays are days of abstinence from meat (not fast days), but we are encouraged to voluntarily give up something for the whole of Lent or add in a good practice we’re not accustomed to doing on a regular basis. I know in the past, Lenten fasts were much more strict, with abstinence from meat, dairy, eggs, etc. for all the forty days and many more fast days, too. So it sounds like that’s what you’re harking back to.
It sounds like you’re living on (small quantities of ) bread and water so far, which strikes me as a REALLY strict fast and inadvisable from a health standpoint. While I think your plan of drinking only water is reasonable and do-able, I’m concerned about your food restrictions being too strict from a health and nutrition standpoint. Do keep good nutrition in mind, since Lent does last well over a month. (Do you plan to observe your food restrictions on Sundays, too, which are not technically part of Lent? Or could you allow yourself more variety then for the sake of nutrition?) Are you taking daily multi-vitamins? You have no health problems that could be aggravated by your food restrictions?
For nutrition: Maybe put back the fruit in your diet? Maybe leave out your most favorite ones, but keep others for vitamins and minerals? Eat lots of vegetables, if you’re allowing yourself those: carrot and celery sticks, sweet peppers, stir-fried veg. with fortified rice, sauteed broccoli/black beans/garlic served over rice. Pasta with marinara sauce? Breaded fried eggplant baked in red sauce without the cheese, just short of an eggplant parmesan?
For protein, look up vegetarian recipes with tofu, soy protein, beans and rice, and beans and corn combinations, which make up “complete” proteins. Are you keeping nuts in your diet? Those are a non-animal source of proteins, too. Peanut butter on celery sticks (with raisins for “ants on a log”) or sandwich bread?
What I try to “give up” during Lent is what I most enjoy – romance novels in previous years, but I’ve lost the taste for them – and more recently, orange juice, chocolate, any treat or dessert-y type foods. That I REALLY will find it difficult to give up, but it won’t compromise my health or nutrition. When I want to do a prayer and fasting for some intention, for a week at a time, I’ll eat one slice of bread plus water for breakfast and lunch, but I’ll eat modest amounts of usual foods for dinner. That also, I think, is making a sacrifice, but not injuring health.