Glancing it looks like the crown of the strawberries is too low, it should protrude from the surface. The water shouldn’t drip directly on them so much. A string hanging from the upper bottle to the back of the net pot should be sufficient to divert the water a bit. Over-watering is easy with the strawbs.

Maybe you could build a greenhouse as a student project

That sounds cool, I look forward to seeing your urine results and commentary… Start a Post and keep it up to date
I just started vermicomposting recently, i will be adding updates soon.

I know ammonia is good for most plants… I would be wary of legumes, I have burned peas with bloodmeal, which decomposes to ammonia rapidly.

It’s good to slowly increase nutrition if you are worried, a sign of over ntrogen is curling of leaves and rapid funky light green growth. You want a nice medium pace of rich green growth. Some plants can be ”burned” by excess nutrition….
what are the symptoms? can you share a image in your OP?

Epsom salts are fine, I use them, just don’t go too overboard. Make sure you balance the pH to around 5.8 – 6.4, this range is safe for all plants and is good for optimum nutrient uptake.
is it an EC tester? EC tends to be twice as high as a PPM test.

What I have been doing to great sucess:

Botanicare, it’s cheap and works better than any other brand I have used.
–10 – 15ml/gal Pro Growth formula
–10ml/gal Liquid Karma (kelp extracts help the plant utilize nutrition more effectively)
–5ml/gal Cal-Mag, contains Calcium, Magnesium(no need for epsoms if you use this), Iron, and other micro-nutrients. I don’t know if it contains sulfur, like epsoms, but it has loads of Magnesium and sulfur deficiency is not very common.
–5 – 10ml/gal Sweet. used on flowering plants during flower/fruiting
–2.5 – 5ml/gal Hydroplex (this is a Phosphorous and Potassium complex along with amino acids) this is good for flowering/fruiting

–5ml/gal (GH)General Organics brand BioRoot, great stuff for the root zone, makes your roots fluffy and hairy, just like they should be
–drops of Thrive Alive Organic, this contains lots of Vitamins essential for healthy plants and helps plants recover from stresses like transplanting.
–Occasionally I’ll add a boost of Myco fungus to boost root health.
–Worm Juice from my worm composter, I add a bit when available, but it’s hot so don’t use too much. Worm juice helps with micro organisms and water soluble nutrition as well as a bonus of Chitin for spicy peppers which stimulates the pepper defense response, ie, spicy oils

Just make sure you are not doubling up on nutritional elements and you balance that pH, when in doubt, know whats in your products.
What all are you mixing, at what ratios?

One place to start is finding the most drought resistant varieties you can, making it easier to cope with water constraints.