I currently am going to a college in a very Christian area, and have faced many of the problems you’ve mentioned here.
What I did going into college was evoke a trusted spirit to create excellent housing, I had a list of aspects I wanted in the housing and one of the aspects of that housing was to have a private room- nobody else in the same room. This allowed me to meditate and do any sort of operation I felt comfortable doing in there. Additionally I had plenty of space. This will also allow you to store all your tools.
Now I don’t know if a foot of wood and plaster between you and your roommates will give you enough ease of mind and separation from the world to perform traditional evocations. Its your call. I tried two things after realizing that the walls didn’t work for me. There are mountains close to the college I am at, and so I broke out my boots and went into the mountains searching for the perfect ritual temple, surrounded by natural beauty!
I called upon the spirits I was working with to guide me to places to do my evocations. I was guided to a cave about fifteen minutes hike into the mountains. On another day I hiked an hour or so to a mountain peak. It had a fitting view; being concealed from the eyes of any hikers who might be walking the nearby trails, it overlooked the very valley and city I influenced through those mountaintop rituals. Definitely added to the “feeling” of power, and I guess I enjoyed the symbolism.
Nevertheless, it was novelty. Taking all that time to simply get to and from the ritual site was very impractical given school, work, etc. This led me to evoke without tools in that private room I had.
Evoke without the candles, remove the athame from your hand, leave the chalice dry and in its storage place. Cast no circle. While I could have easily used these things in my room as they are not loud and I can easily reach up and remove the smoke alarm from the ceiling; I wanted to develop the skill to evoke without tools. Without bounds; anytime, anyplace.
A manifestation base? Fresh blood is the best base, its full of whatever the hell it is that facilitates evocation. Rather than taking a knife to your finger to spill that energy from you; learn to spill the energy from your pores, to force it out through the thin layers of skin that wrap your body. Turn your entire physical being into the manifestation base. Congratulations: you now have nothing at all stopping you from evoking.
Some important last points:
-Don’t expect physical evocation with this technique, as others have already pointed out, evoking without tools is “astral evocation”. Is it as powerful as physical evocation? I don’t know. If I can communicate with the entity and receive answers to my questions- If I can achieve my ritual goals- then the reason we do Magick: the results-- are still obtained. If the results are not obtained then practice is required.
-Just because you are able to call forth the gods of heaven and hell in an instant and at your whim and pleasure does not mean you should. I have more than on on one occasion offended my allies by abusing their time and attention. Consider the preferences of the spirits you work with even as you consider your own preferences. There is a reason we don’t use blasting rods or threaten with god names when we call forth demons: they sure don’t prefer it. Similarly, different spirits prefer different things in their evocations, it is always wise to contact a spirit before the evocation and let them know your intent to evoke them; as well as ask if they have any preferences in how the evocation is performed, explaining how you evoke in a non-traditional manner. Some may ask you to use specific tools.
-For all this, you may find creating an astral temple and evoking there to be much more effective. I simply saw you describing many of the challenges I had and thought I could give a bit of advice from my experiences. Good luck with the OAA and good luck starting college! You will love it.