Holy ink
Clerics can scribe scrolls, just like wizards. However, their ink is created wholly differently than the almost alchemical process of wizardly ink. Instead, it relies on divine beneficence.
First, you need a large basin made of precious metals: this could be anywhere from copper to platinum; the more precious the metal, the better the results. This is too large to carry around personally, though it could be put on a wagon and carried by horses. The copper basin needs at least 300 GP worth of copper if you were to smith your own.
Luckily, the Temple of Ogun already has such a basin already! The Temple of Ogun can let a cleric of their faith or someone who earns their favorby doing services for them to use it for a day for 25 GP.
Once you've obtained use of the basin, you pour one flask of holy water into it. This holy water can be purchased from most temples for 25 GP, or created by a cleric or paladin themselves if they have powdered silver. Holy water is but one base; other bases exist, such as magical honey, blessed rainwater obtained on certain weeks, and so forth, if you wish to use those instead. This serves as the foundation for the ink to be created.h
To the holy water, you add holy ash, created from burning special herbs such as palm leaves, along with butter, in worship. This can be harvested from the wilderness, or purchased from a temple for 25 GP.
With the holy ash and water mixed together, you conduct a religious ceremony of prayer and fasting that takes place over one day. During this ceremony, you utter mystic words of power to imbue the basin's contents with the holy change required: you or someone else must cast the blessspell upon the mixture, and use the auguryspell to divine the best methods of religious petition to make.
After the day's ceremonies are finished, if successful, you'll have 2 oz. of ink, enough to scribe 50 GP worth of cleric or paladin spell scrolls (a level 1 spell costs 50 GP of such ink to make, so enough to make a level 1 spell). This ink loses all potency if not stored in a specially enchanted inkwell made of ivory, which costs 5 GP.
You must spend the day after the ceremony doing nothing but resting. Thus, each inkwell worth of ink takes 2 days to produce. You can create 1 inkwell a week in this way without it impacting your downtime activity, but can make up to 3 if you make it an entire week's downtime activity.
Thus, in total it will cost you 80 GP and 2 days to create this holy ink, along with permission to use the basin of the Temple in question (or a basin of your own). Someone will have to cast bless and augury.
There is also a small chance that calling on divine power to create such ink results in a religious quest of some kind. Each time you create an inkwell, roll a d10: on a 10, your prayers result in a vision or divine request, big or small. This must be carried out before another inkwell can be made.