Most dictionaries don't say whether a noun is count vs. mass. Short of asking a fluent English speaker, where can you get this kind of information?
I've tried asking various other ESL/EFL people I know this same question, and also tried googling it, but to no avail.
Most English dictionaries used and published in the United States don't include that information, just as they don't provide IPA-based phonemic transcription. However, dictionaries published in the UK and elsewhere sometimes do, especially dictionaries for English learners.
One American online exception is Merriam-Webster's Learner's Dictionary, which dutifully reports that pea and bean are both [count], while rice and sand are both [noncount].
Beware broad-brush approaches, even if you find a dictionary offering the count – uncount classification. Some – perhaps many – nouns are non-count in some senses and count in others. Coffee is a good example – its basic sense is uncount:
Coffee is a drink made by infusing the ground beans of Coffea arabica etc.
Too much coffee can be bad for you.
However, different products will be count:
Coffees produced using a higher proportion of robusta beans in the blend tend to be bitter and have less flavour but better body than those with a higher proportion of arabica beans.
And ellipsis produces another count-noun polyseme:
Two coffees, please.
(ie two cups / mugs of coffee)
Rice is count when different strains are meant, and sand when different sorts are being mentioned. (There is a poetic use of sands also.) Even furnitures is allowed in certain situations.
There are also grey areas – you'd probably ask for less peas rather than fewer peas (especially if they were mushy) on your plate. Non-count doesn't always mean that counting would be impossible - confetti is treated as a singular non-count noun. The difficulty ensuing when one tries to use algae in both count and non-count senses has recently been addressed in a different thread.
A good place to start looking is http://learnenglish.britishcouncil.org/en/english-grammar/nouns/common-problems-countuncount-nouns.
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A response to the request for resources (though this properly belongs on ELU.Meta}:
You should try Wiktionary. It lists the plural, or indicates that the noun is uncountable. For example, rice is listed as uncountable, and bean has the plural listed as beans.
https://oxfordlearnersdictionaries.com mentions if given word (or one of its meanings) is uncountable
Android app from "dictionary.com" allows to see if given word is a mass noun or not. Although you may need to buy one of upgrades to have this functionality.
Example: 
rice
[ raɪs ]
mass noun
- Rice consists of white or brown grains taken from a cereal plant. You cook rice and usually eat it with meat or vegetables.
But be warned, not all words in this app have information about their countability. Like word "ice cream" can be either countable or uncountable, but the app doesn't mention either case.
wikiontary and etymologyonline.com are good sources.
Mass / COME / COMMITTER Nouns are Continuum-like descriptions for features that are integrated / unified / committed to making up the object (usually because they are continuous or undifferentiated)
COUNTER Nouns are Discrete-like descriptions for features that are separately making up the object
The best account I know is in the Oxford English Grammar by Sidney Greenbaum. At 3.26 he explains the concept of number in nouns.
The category of number distinguishes between singular and plural nouns. Number contrast does not ordinarily apply tp proper nouns, such as Caroline or the Netherlands. Common nouns can be either count (or countable) or non-count (or uncountable or mass). Count nouns have number contrast:
- house/houses, nurse/nurses. Non-count nouns generally do not have a plural form: wine,information. but many of them are occasionally converted into count-nouns to refer to kinds or quantities: French wines, two teas (cups of tea).
So the word 'water' is an obvious non-count noun. Most of the time, it refers to a mass of the stuff, but not always, as Greenbaum illustrates above.
Beyond that, there are other special cases. Proper names can be used in the plural, as some people might speak of someone they dislike as "a little Hitler" and you could speak of "little Hitlers" of a disliked group of people.
Poetry and so rhetoric can generate plurals, as in the Old Testament.
"By the waters of Babylon I laid down and wept."
Obviously, these are not 'types' of water, but more probably stretches of water. The 'waters' that break at the onset of childbirth are obviously not a plurality of water but simply have always been spoken of as if 'they' were. That is why we have to be very careful not to be tied down to a fixed definition.
Nevertheless, 'water' is (normally used as) a non-count noun without a plural. The stuff it (normally) refers to can be measured, but not counted (because it is a mass of the stuff). Yet poets love to put it in the plural, as did the Roman Horace in his Odes Book IV ode 1, a love poem to a young man.
In my night time dreams / now I have caught and hold you; now I pursue you in flight / now through the grasses of the Field / of Mars, now, cruel man, through rushing waters.
