Is it permissible to gradually perform religious acts of worship and obligatory duties if committing to them all at once is difficult for a recovering addict, and does this apply to prayer and fasting?

A Muslim is obligated to perform the duties according to his capacity. If he is unable to do something or finds it excessively difficult, he is excused. Prayer in the mosque is a religious requirement. If he misses the prayer or finds it difficult to go, he should pray at home or whenever he wakes up. Fasting is an obligatory act that is not permissible to abandon except for a valid excuse. If delaying medication until after breaking the fast would harm him, then he is permitted to break his fast. If there is no harm, then he must fast. If he feels extreme difficulty despite being healthy, he should make the intention to fast from the night, and if significant difficulty arises and he fears harm to himself, he should break his fast, abstain for the rest of the day, and make it up later. However, if he is ill, his illness permits him to break the fast, and he should supplicate frequently and earnestly to Allah Almighty.