0. Have transportation (or a nearby store), the ability to boil water, and a large vessel to put water and food into. You may also want a sheltered place to cook/consume the food, though this is not required.
1. Go to the nearest food store. Anything larger than a kiosk will do.
2. Buy bags of rice. Any kind will do.
3. Buy bags of beans. Any kind will do.
3a. Buy lentils or chicken if you want more variety. Any kinds will do.
3b. Buy salt or spices if you like the flavor of salt or spices. Any kind will do.
4. Go home, making sure to take the items you have purchased with you.
4a. Rice and beans are stable at room temperature for a very long time. Do not let them be consumed by pests, however.
5. Throw a few days of consumption worth of those items you purchased into a pot of boiling water. Don't try to boil the bags themselves unless you are really desperate.
6. Boil for a while. 25 minutes will probably do. You can do other stuff during this 25 minutes. You can remove the water afterward if you desire.
6a. This meal is stable at room temperature (23C) for a couple of days time. You will need to find a way of cooling the food to 4C if you wish to keep it longer-- up to 7 days maximum.
7. Now you have a flavorless though quite filling and nutritious meal. It's probably cheaper, more nutritious, and more flavorful than Soylent. You can survive on this for a long, long time.
7a. Don't forget to actually eat the food you have prepared. A utensil such as a fork or spoon may be useful, though not required. Additionally, a smaller secondary vessel such as a bowl may be useful, though not required.
8. Repeat as hungry; return to step 0 if supplies run out.
Bam, now nobody has a single excuse to eat Soylent.
