1. What are the requirements for valid Eucharistic bread and wine?

Canon law requires that the bread be wheat bread, recently made so that there is no danger of its having spoiled. Bread made of other than wheat flour or with other additives of such quantity that according to common estimation it cannot be said to be wheat bread would not be valid for the celebration of Eucharist. Additives other than wheat flour and water are illicit (unlawful). Ancient tradition requires that the bread be unleavened. The wine must be natural wine of the grape and not corrupt. Wine made from other fruit or chemically composed is not valid for the Eucharist. 

Likewise it cannot have additives such that it would be substantially altered, nor may water in equal or greater quantities than the wine be added. The addition of sulfites as a purifying agent does not render the wine corrupt.  

2. When Communion is to be distributed under both species are there any requirements regarding the manner in which this is done? 

Communion under both species may be distributed by having the communicant drink from the chalice.

3. If someone is allergic to one or the other of the Eucharistic species may a L substitute be given? 

A communicant may receive Communion .under either form, even under :Blood alone? 1 In cases of  gluton (wheat) allergy, Communion may be given under the species of Blood alone; a substitute form of bread may not be used. 

4. What kinds of requirements are there for using special ministers of the Eucharist? The ordinary minister of the Eucharist is a bishop, priest or deacon. When there are not sufficient ordinary ministers present at a given celebration to meet the needs of the community, an properly delegated lay person may serve as a extraordinary minister of the Eucharist. These ministers of the Eucharist are commissioned for that ministry for a set period of time by the bishop at the sole recommendation of the pastor.. In exceptional cases when there is an immediate and serious need and no special minister is present, a priest may depute an individual for this ministry on that single occasion. 

5. What are the requirements for the Eucharistic fast? 
Prior to reception of the Eucharist one is to fast from food and drink, with the exception of water and medicine, for at least one hour. The elderly and sick, as well as those who care for them, are not required to maintain an hour's fast. 

6. Is a mentally handicapped or developmentally disabled person allowed to receive Communion at Mass? 
In order for developmentally disabled or mentally retarded persons to be admitted to Eucharist it is required that they be appropriately disposed to receive the sacrament, be adequately prepared so that they are able to distinguish the Eucharist from ordinary food,  and be able to receive communion reverently. Parents or guardians and the pastor share responsibility for seeing to the preparation for and the participation in the Eucharist by such individuals.

7. What "liturgical postures" are required of a congregation in church and during the reception of the Eucharist? 
Since cultural and ethnic differences play a large part in determining respectful posture in given situations, a uniform diocesan guideline is given in this regard. The posture of standing during the reception of Holy Communion, shows respect and unity as a member of the one Body of Christ, combined with an attitude of worship and prayer.