to reproach / hold in front / last
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to reproach someone with something
To reproach someone for a mistake, an omission, or negative behavior, or to remind them of it.
Sie hielt ihm bei jedem Streit seine früheren Fehler vor.
In every argument, she reproached him with his past mistakes.
'Vorhalten' is a separable verb. In a main clause, the prefix 'vor' separates and moves to the end of the sentence. In the infinitive with 'zu', 'zu' stands between the prefix and the verb.
Er hält ihr ihre Fehler vor.
He reproaches her with her mistakes.
You can recognize the meaning from the sentence structure: If a person is in the dative ('jemandem etwas vorhalten' (to reproach someone with something)), it is about a reproach. If it is about supplies that are sufficient, the verb is usually used without an object. If something is physically held in front of something, there is an accusative object.
Sie hielt ihm seine Unpünktlichkeit vor. (Vorwurf)
She reproached him with his unpunctuality. (reproach)
In the meaning 'vorwerfen' (to reproach/accuse), the verb needs a fixed structure: The person you reproach is in the dative, and the reproach itself is in the accusative.
Warum hältst du mir das jetzt vor?
Why are you reproaching me with that now?
When you hold something protectively or to cover yourself, the verb is used reflexively with a dative pronoun: sich die Hand vor den Mund halten (to hold one's hand in front of one's mouth).
Sie hielt sich erschrocken die Hände vor das Gesicht.
Startled, she held her hands in front of her face.
In this meaning, 'vorhalten' (to last) is used without an object. The subject of the sentence is the supply that is sufficient for a certain period of time.
Wie lange wird unser Wasservorrat noch vorhalten?
How long will our water supply last?
to hand / to suffice
'reichen' and 'vorhalten' can both have to do with having enough means or supplies available. 'reichen' simply says that an amount is enough. 'vorhalten' is used more when an institution or organization keeps supplies, materials, or resources available so that they are on hand for a certain period of time or for an emergency. The word sounds more formal and technical. Learners may confuse it with 'reichen' because it also involves a sufficient amount. In everyday language, 'reichen' is usually more natural; 'vorhalten' fits better with planning, administration, or supply.
Die Firma hält für Notfälle zusätzliche Geräte vor.
The company keeps additional equipment available for emergencies.
Im Krankenhaus reichen die Medikamente noch bis Freitag.
In the hospital, the medication will last until Friday.